nitrite(in) + H(+)(out) => nitrite(out) + H(+)(in)
nitrite(in) + h(+)(out) => nitrite(out) + h(+)(in)
nitrite(in) + H(+)(out) => nitrite(out) + H(+)(in)
nitrite(in) + h(+)(out) => nitrite(out) + h(+)(in)