spermidine + A + H2O = 4-aminobutanal + propane-1,3-diamine + AH2
spermidine + a + h2o = 4-aminobutanal + propane-1,3-diamine + ah2
spermidine + A + H2O = 4-aminobutanal + propane-1,3-diamine + AH2
spermidine + a + h2o = 4-aminobutanal + propane-1,3-diamine + ah2