ala-synthetase activity was normal in both cases of pyridoxine-responsive anaemia while they were receiving pyridoxine therapy but in one of these cases , studied at repeated intervals after withdrawal of pyridoxine therapy , the bone marrow ala-synthetase activity fell to very low levels unless pyridoxal-phosphate was added in vitro .
C0034272
therapy
C0034266
pyridoxal-phosphate