GMP + diphosphate = guanine + 5-phospho-alpha-D-ribose 1-diphosphate
gmp + diphosphate = guanine + 5-phospho-alpha-d-ribose 1-diphosphate
GMP + diphosphate = guanine + 5-phospho-alpha-D-ribose 1-diphosphate
gmp + diphosphate = guanine + 5-phospho-alpha-d-ribose 1-diphosphate