Heptosyltransferase (LPS core synthesis) (heptosyl-(1->3Hep2)-glucosyl-(1->4Hep1)-heptosyl-(1->3)-heptosyl-(1->5)-kdo2-lipidA)
adphep_LD_c + ghhlipa_c ⇌ adp_c + h_c + hghhlipa_c
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