guanosine(out) + Na(+)(out) <=> guanosine(in) + Na(+)(in)
guanosine(out) + na(+)(out) <=> guanosine(in) + na(+)(in)
guanosine(out) + Na(+)(out) <=> guanosine(in) + Na(+)(in)
guanosine(out) + na(+)(out) <=> guanosine(in) + na(+)(in)