x1 = Asp
x2 = AK1
x3 = Lys
x4 = AdoMet
x5 = AspP
x6 = AK2
x7 = AKHSDHI
x8 = AKHSDHII
x9 = Thr
x10 = ASADH
x11 = ASA
x12 = DHDPS1
x13 = DHDPS2
x14 = Hser
x15 = PHser
x16 = HSK
x17 = TS1
x18 = Phosphate
x19 = Cys
x20 = CGS
x21 = Cysta
x22 = TD
x23 = Ile
x24 = Val
x25 = LysTRNA
x26 = ThrTRNA
x27 = IleTRNA
x28 = LKR
x29 = Sacc
x30 = THA
x31 = Gly