L-valine(in) + Na(+)(in) <=> L-valine(out) + Na(+)(out)
l-valine(in) + na(+)(in) <=> l-valine(out) + na(+)(out)
L-valine(in) + Na(+)(in) <=> L-valine(out) + Na(+)(out)
l-valine(in) + na(+)(in) <=> l-valine(out) + na(+)(out)