activity of bone marrow delta-aminolaevulinate ( ala ) synthase was markedly reduced to 7 pmole ala/10 ( 6 ) erythroblasts/30 min ( normal 127 +/- 29 ) but was enhanced fivefold by pyridoxal phosphate ( normal 0 % -- 25 % increase ) .
C0005953
bone marrow
C0014762
erythroblasts