Clean Ensembl reference gene list

Main works are add column names for the table, add gene names to new table, replace missing gene names with Ensembl ID then remove duplicated gene, then return the clean formatted gene list.

clean_ensgene(refgene, ens_id)

Arguments

refgene	ensembl reference gene download from UCSC website
ens_id	ensembl id download from UCSC website

Value

formatted gene list.