a ribonucleoside 5'-diphosphate + GDP => a ribonucleoside 5'-phosphate + GTP
a ribonucleoside 5'-diphosphate + gdp => a ribonucleoside 5'-phosphate + gtp
a ribonucleoside 5'-diphosphate + GDP => a ribonucleoside 5'-phosphate + GTP
a ribonucleoside 5'-diphosphate + gdp => a ribonucleoside 5'-phosphate + gtp