citrate(out) + 4 Na(+)(out) <=> citrate(in) + 4 Na(+)(in)
citrate(out) + 4 na(+)(out) <=> citrate(in) + 4 na(+)(in)
citrate(out) + 4 Na(+)(out) <=> citrate(in) + 4 Na(+)(in)
citrate(out) + 4 na(+)(out) <=> citrate(in) + 4 na(+)(in)