Hi, The first column of the file is the taxid. For H. sapiens, the id is 9606. If you search for all the lines starting in 9606 and extract the values from the third column (Discontinued_GeneID), you should get a list of withdrawn taxids. Like this:
grep "^9606" gene_history | cut -f3 > Hsapiens_withdrawn-genes.txt
I hope it helps.
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