a lipid IIA + a 1,2-diacyl-sn-glycero-3-phosphocholine = a lipid IIB + a 2-acyl-sn-glycero-3-phosphocholine
a lipid iia + a 1,2-diacyl-sn-glycero-3-phosphocholine = a lipid iib + a 2-acyl-sn-glycero-3-phosphocholine