Veer, E. van der

chick fusion enzyme heterokaryon fibroblast erythrocyte activity nuclei chick erythrocytes repair fluid disease level fluid cells synthesis lysosomal expression cell types culture study group lysosomal enzymes galjaard chick nuclei assay diagnosis rna synthesis result control gene expression experiment deficiency patient protein number function chick erythrocyte nuclei reactivation suppression dna synthesis defect s-galactosidase enzyme activities microchemical marker 8 days method table erythrocyte nuclei a-glucosidase nucleus homogenate galactosidase 24 hours ringertz induction glucose xeroderma pigmentosum factor pregnancy restoration xeroderma dna repair analysis chromosome s-hexosaminidase exp.cell res complementation difference hybridization 15 days strain amount harri paper pigmentosum bootsma cell homogenates mouse van der