does anyone know why the following code gives columns of NAs for minor_allele and minor_allele_freq (other data extracted by this method seems fine) ? library("biomaRt"); snp.db <- useMart(host = "https://www.ensembl.org", "ENSEMBL_MART_SNP", dataset = "hsapiens_snp"); nt.biomart <- getBM(attributes = c("refsnp_id", "minor_allele", "minor_allele_freq"), filters = c("snp_filter"), values = c("rs10788066", "rs765840164"), mart = snp.db, uniqueRows = TRUE)