 glucos 6-phosphat dehydrogenas 6-phosphoglucon dehydrogenas len blood speci activ glucos 6-phosphat 6-phosphoglucon dehydro- genas measur len erythrocyt man speci wide variat individu speci correl activ enzym len activ erythrocyt speci wide rang activ glucos 6-pho- phate dehydrogenas 6-phosphoglucon dehydrogenas len blood speci speci glucos 6-pho- phate dehydrogenas activ erythrocyt level consid defici man sorbitol content len correla- ted glucos 6-phosphat dehydrogenas activ 