spermidine + A <=> 1-pyrroline + propane-1,3-diamine + AH2
spermidine + a <=> 1-pyrroline + propane-1,3-diamine + ah2
spermidine + A <=> 1-pyrroline + propane-1,3-diamine + AH2
spermidine + a <=> 1-pyrroline + propane-1,3-diamine + ah2