Preview/Index

Preview function

• rather than displaying the actual documents retrieved by your search, Preview just displays your search statement and the number of hits it found
• useful for quickly trying various searches for a topic before actually displaying the results

Index function

• browse the index for a specific search field
• view:
• broad and narrow terms
• correct spellings and misspellings
• syntax for entering specific terms (properties, dates, etc.)
• select one or more terms from the index
• add selected term(s) to your query using the AND, OR, NOT buttons

What other molecule types are available in Entrez Nucleotides, in addition to those listed on the Limits page? What RefSeq subsets are available?