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Condensation reactions forming polyamines from L-aspartic-β-semialdehyde. Reaction of L-aspartic–β-semialdehyde with putrescine or 1,3-diaminopropane by carboxynorspermidine synthase forms carboxyspermidine or carboxynorspermidine, which are decarboxylated by carboxynorspermidine decarboxylase to form spermidine or sym-norspermidine, respectively.
