2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + hexadecanoyl-CoA <=> 1-hexadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + CoA
2-(9z-octadecenoyl)-sn-glycero-3-phospho-l-serine + hexadecanoyl-coa <=> 1-hexadecanoyl-2-(9z-octadecenoyl)-sn-glycero-3-phospho-l-serine + coa