I'm trying to use biomaRt to get attributes for a bunch of genes. When I try it, I notice that there are some missing values. Can someone tell me why?
library(biomaRt) mart <- useMart(biomart="ensembl", dataset="mmusculus_gene_ensembl")
results <- getBM(attributes = c("gene_biotype", "mgi_symbol"), filters = "mgi_symbol", values = "Gm4890", mart = mart)
Yet I can see the gene plainly hhere: http://www.informatics.jax.org/marker/MGI:3779445