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Human Genome Assembly GRCh37

Information on tiling path files (TPFs) for the assembly is available at TPF Overview.

Other assembly versions:
Chromosome lengths are calculated by summing the length of the placed scaffolds and estimated gaps.
Chromosome Total length (bp) GenBank accession RefSeq accession
1 249,250,621 CM000663.1 NC_000001.10
2 243,199,373 CM000664.1 NC_000002.11
3 198,022,430 CM000665.1 NC_000003.11
4 191,154,276 CM000666.1 NC_000004.11
5 180,915,260 CM000667.1 NC_000005.9
6 171,115,067 CM000668.1 NC_000006.11
7 159,138,663 CM000669.1 NC_000007.13
8 146,364,022 CM000670.1 NC_000008.10
9 141,213,431 CM000671.1 NC_000009.11
10 135,534,747 CM000672.1 NC_000010.10
11 135,006,516 CM000673.1 NC_000011.9
12 133,851,895 CM000674.1 NC_000012.11
13 115,169,878 CM000675.1 NC_000013.10
14 107,349,540 CM000676.1 NC_000014.8
15 102,531,392 CM000677.1 NC_000015.9
16 90,354,753 CM000678.1 NC_000016.9
17 81,195,210 CM000679.1 NC_000017.10
18 78,077,248 CM000680.1 NC_000018.9
19 59,128,983 CM000681.1 NC_000019.9
20 63,025,520 CM000682.1 NC_000020.10
21 48,129,895 CM000683.1 NC_000021.8
22 51,304,566 CM000684.1 NC_000022.10
X 155,270,560 CM000685.1 NC_000023.10
Y 59,373,566 CM000686.1 NC_000024.9
Total lengths are calculated by summing the length of the sequenced bases and estimated gaps.
Chromosome All scaffolds Placed scaffolds Unplaced scaffolds
1 249,904,550 249,250,621 653,929
2 243,199,373 243,199,373 0
3 198,022,430 198,022,430 0
4 191,535,534 191,154,276 381,258
5 180,915,260 180,915,260 0
6 171,115,067 171,115,067 0
7 159,321,559 159,138,663 182,896
8 146,440,111 146,364,022 76,089
9 141,696,573 141,213,431 483,142
10 135,534,747 135,534,747 0
11 135,046,619 135,006,516 40,103
12 133,851,895 133,851,895 0
13 115,169,878 115,169,878 0
14 107,349,540 107,349,540 0
15 102,531,392 102,531,392 0
16 90,354,753 90,354,753 0
17 81,529,607 81,195,210 334,397
18 78,081,510 78,077,248 4,262
19 59,380,841 59,128,983 251,858
20 63,025,520 63,025,520 0
21 48,157,577 48,129,895 27,682
22 51,304,566 51,304,566 0
X 155,270,560 155,270,560 0
Y 59,373,566 59,373,566 0
Un 3,675,142 na 3,675,142
Genome 3,101,788,170 3,095,677,412 6,110,758
Region Location Sequence types Scaffold length
MAPT chr17:43384864-44913631 ALT 1,680,828
MHC chr6:28477797-33448354 ALT 33,085,269
UGT2B17 chr4:69170077-69878175 ALT 590,426
N50 is a measure of contiguity. 50% of the bases reside in a scaffold of this length or greater.
Chromosome All scaffolds Placed scaffolds Unplaced scaffolds
1 57,411,349 57,411,349 547,496
2 68,452,323 68,452,323 0
3 100,537,107 100,537,107 0
4 115,591,997 115,591,997 191,469
5 46,395,641 46,395,641 0
6 58,720,166 58,720,166 0
7 50,360,631 50,360,631 182,896
8 38,440,852 38,440,852 38,914
9 62,237,592 62,237,592 169,874
10 79,420,533 79,420,533 0
11 41,593,379 41,593,379 40,103
12 71,516,776 71,516,776 0
13 67,740,324 67,740,324 0
14 88,289,540 88,289,540 0
15 53,620,202 53,620,202 0
16 42,003,582 42,003,582 0
17 44,983,201 44,983,201 174,588
18 25,808,112 25,808,112 4,262
19 31,387,201 31,387,201 159,169
20 31,409,461 31,409,461 0
21 28,617,430 28,617,430 27,682
22 29,755,346 29,755,346 0
X 27,775,034 27,775,034 0
Y 6,265,435 6,265,435 0
Un 164,239 na 164,239
Genome 46,395,641 46,395,641 172,149
Region Location Sequence types Scaffold length
MAPT chr17:43384864-44913631 ALT 1,680,828
MHC chr6:28477797-33448354 ALT 4,683,263
UGT2B17 chr4:69170077-69878175 ALT 590,426
Ungapped lengths are calculated by summing the length of sequenced bases only. 'Ns' are excluded.
Chromosome All scaffolds Placed scaffolds Unplaced scaffolds
1 225,934,550 225,280,621 653,929
2 238,204,522 238,204,522 0
3 194,797,140 194,797,140 0
4 188,042,934 187,661,676 381,258
5 177,695,260 177,695,260 0
6 167,395,067 167,395,067 0
7 155,536,559 155,353,663 182,896
8 142,964,911 142,888,922 75,989
9 120,626,573 120,143,431 483,142
10 131,314,747 131,314,747 0
11 131,169,619 131,129,516 40,103
12 130,481,395 130,481,395 0
13 95,589,878 95,589,878 0
14 88,289,540 88,289,540 0
15 81,694,769 81,694,769 0
16 78,884,753 78,884,753 0
17 78,129,607 77,795,210 334,397
18 74,661,510 74,657,248 4,262
19 56,060,841 55,808,983 251,858
20 59,505,520 59,505,520 0
21 35,134,224 35,106,642 27,582
22 34,894,566 34,894,566 0
X 151,100,560 151,100,560 0
Y 25,653,566 25,653,566 0
Un 3,675,142 na 3,675,142
Genome 2,867,437,753 2,861,327,195 6,110,558
Region Location Sequence types Scaffold length
MAPT chr17:43384864-44913631 ALT 1,580,828
MHC chr6:28477797-33448354 ALT 27,684,948
UGT2B17 chr4:69170077-69878175 ALT 590,426
Spanned gaps are found within scaffolds and there is some evidence suggesting linkage between the two sequences flanking the gap. Unspanned gaps are found between scaffolds and there is no evidence of linkage.
Spanned gaps Unspanned gaps
Chromosome   All scaffolds Placed scaffolds Unplaced scaffolds All scaffolds Placed scaffolds Unplaced scaffolds
1 19 19 0 22 22 0
2 6 6 0 15 15 0
3 0 0 0 7 7 0
4 1 1 0 12 12 0
5 1 1 0 6 6 0
6 6 6 0 8 8 0
7 9 9 0 8 8 0
8 2 1 1 9 9 0
9 15 15 0 29 29 0
10 8 8 0 12 12 0
11 4 4 0 11 11 0
12 4 4 0 8 8 0
13 0 0 0 10 10 0
14 0 0 0 5 5 0
15 2 2 0 10 10 0
16 1 1 0 10 10 0
17 2 2 0 5 5 0
18 2 2 0 7 7 0
19 1 1 0 8 8 0
20 2 2 0 9 9 0
21 9 8 1 14 14 0
22 0 0 0 9 9 0
X 5 5 0 21 21 0
Y 2 2 0 16 16 0
Un 0 na 0 0 na 0
Genome 101 99 2 271 271 0
Region Location Sequence types Scaffolds Spanned gaps Unspanned gaps
MAPT chr17:43384864-44913631 ALT 1 2 0
MHC chr6:28477797-33448354 ALT 7 98 0
UGT2B17 chr4:69170077-69878175 ALT 1 0 0
Scaffold counts.
Chromosome All scaffolds Placed scaffolds Unplaced scaffolds
1 21 19 2
2 13 13 0
3 4 4 0
4 12 10 2
5 5 5 0
6 3 3 0
7 8 7 1
8 9 7 2
9 28 24 4
10 8 8 0
11 5 4 1
12 6 6 0
13 5 5 0
14 1 1 0
15 7 7 0
16 4 4 0
17 10 6 4
18 4 3 1
19 6 4 2
20 4 4 0
21 9 8 1
22 4 4 0
X 17 17 0
Y 17 17 0
Un 39 na 39
Genome 249 190 59
Region Location Sequence types Scaffold length
MAPT chr17:43384864-44913631 ALT 1
MHC chr6:28477797-33448354 ALT 7
UGT2B17 chr4:69170077-69878175 ALT 1
General
Assembly nameGRCh37
Release date2009-02-27
Assembly typehaploid-with-alt-loci
Release typemajor
Assembly units10
Total bases3,137,144,693
Total non-N bases2,897,293,955
Primary assembly N5046,395,641
Regions
Total regions7
Regions with alternate loci3
Regions with FIX patches0
Regions with NOVEL patches0
Regions as PAR4
Alternate loci and patches
Alternate loci9
Alternate loci aligned to primary assembly9
FIX patches0
FIX patches aligned to primary assembly0
NOVEL patches0
NOVEL patches aligned to primary assembly0