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Anat Embryol (Berl). 2004 Dec;209(2):153-6. Epub 2004 Nov 19.

Expression of maf-B mRNA in the epithelium around the eyelid closure of the mouse eye at embryonic day 18.

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Department of Ophthalmology and Visual Sciences, Hokkaido University Graduate School of Medicine, N15 W7, Kita-ku, 060-8638, Sapporo, Japan.


Maf encodes a transcription factor protein containing a typical basic leucine zipper domain structure, a motif for protein dimerization and DNA binding. We examined the expression of maf-B mRNA in the epithelium around the eyelid closure. Expression of maf-B mRNA was examined in C57Bl6 mice at the embryonic stages in 12.5 days of gestation (E12.5) and E18 using in situ hybridization with 35S-labeled antisense riboprobes. In embryos studied 12.5 days postconception, a message specific for maf-B was not detected around the developing eyelid. In contrast, maf-B was strongly expressed in the epithelium of the eyelid closure at E18. Expression of maf-B was strongly noted in the suprabasal differentiating cells derived from the basal layer of the conjunctiva and epidermis. In contrast, basal cells in the eyelid closure and in the epidermis, as well as keratinizing cells, did not express maf-B. These data indicate that maf-B mRNA is expressed during development of the eyelid closure.

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