To the functional category related to the `` cell envelope 
PhoPQ-regulated genes include lpxO , whose product results in the addition of 2-hydroxymyristate to the 3 = position of lipid-A ( A ) ; pagL , whose product results in deacylation at the 3 = position of lipid-A ( B ) ; and pagP , whose product results in the addition of a palmitate chain to the 2 = position of lipid-A ( C ) .