Could please advise me on how to solve some of the genes that bitr() function fail to convert gene SYMBOL TO ENTREZID. This is the command line that I used in clusterprofiler package
sig.gene <- bitr(rownames(gene), fromType="SYMBOL", toType = "ENTREZID", OrgDb = org.Hs.eg.db)
here is the warning message.
In bitr(rownames(gene), fromType = "SYMBOL", toType = "ENTREZID", : 9.61% of input gene IDs are fail to map...
Thank you so much for your help!!!