spermidine(out) + ATP + H2O => spermidine(in) + ADP + phosphate + H(+)
spermidine(out) + atp + h2o => spermidine(in) + adp + phosphate + h(+)
spermidine(out) + ATP + H2O => spermidine(in) + ADP + phosphate + H(+)
spermidine(out) + atp + h2o => spermidine(in) + adp + phosphate + h(+)