Ca(2+)(in) + 3 Na(+)(out) <=> Ca(2+)(out) + 3 Na(+)(in)
ca(2+)(in) + 3 na(+)(out) <=> ca(2+)(out) + 3 na(+)(in)
Ca(2+)(in) + 3 Na(+)(out) <=> Ca(2+)(out) + 3 Na(+)(in)
ca(2+)(in) + 3 na(+)(out) <=> ca(2+)(out) + 3 na(+)(in)