A total of 100 Chinese blood donors (50 from Shen-Zhen and 50 from Taiwan)
were studied by the participants in addition to 9 reference samples. A new
nomenclature for the CR1 structural alleles was recommended by the particip
ants which would use a numbering system, e.g. CR1*1. The structural allele
frequencies in the Chinese were: CR1*1 (190 kD) 0.96, CR1*2 (220 kD) 0.03,
CR1*3 (160 kD) 0.01 and CR1*4 (250 kD) 0.00, The HindIII expression polymor
phism was also studied and the high expressing allele had a gene frequency
of 0.71 while the low expressor gene frequency was 0.28. Erythrocyte copy n
umbers were quantified and compared between laboratories with good correlat
ion (R = 0.55-0.88), The mean (+/- SD) erythrocyte copy number was 463 (+/-
229) in the Taiwan donors and 446 (+/- 207) in the Mainland Chinese.