Substrate (10 μM)

PGH (nmole/min/mg)

PGH %

CPG (nmole/min/mg)

CPG %

PABA-GLU

0.145 + 0.0022

100

0.972 + 0.0035

100

5-formyl-tetrahydrofolate

ND

0

1.49 + 0.00013

150%

5-methyl-tetrahydrofolate

ND

0

4.47 + 0.00026

460%