I have a gene list generated by RefSeq data downloaded from UCSC genome browser, and they have IDs, begining with NM or NP. (for example, NM_001032214) They are transcript_IDs.
And I'm gonna run GO term analysis by DAVID, by selecting identifier as RefSeq-mRNA, only 560/980 of my gene IDs are recognized. I don't understand why is this happened? What should I do to include all of my genes?