https://www.nf-kbinhibitor.com/index.php/2016/11/16/the-vpu-gene-according-to-the-sequence-in-1-was-cloned-in-the-pmal-p2x-commercial-plasmid-new-england-biolabs-ipswich-ma-that-carries-a-p-lac-promotor-and-antibiotic-resistance-the-plasmid-is/