hypoxanthine(out) + Na(+)(out) = hypoxanthine(in) + Na(+)(in)
hypoxanthine(out) + na(+)(out) = hypoxanthine(in) + na(+)(in)
hypoxanthine(out) + Na(+)(out) = hypoxanthine(in) + Na(+)(in)
hypoxanthine(out) + na(+)(out) = hypoxanthine(in) + na(+)(in)