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Table 2

Genotypes and Phenotypes of Complement C4A and C4B in the Normal Caucasian Population

C4 genotypes
No. of individuals studied150
(No. of chromosome 6)(300)
Total no. of C4 genes present590
Frequency of long C4 genes76.2%
Frequency of short C4 genes23.7%
Phenotypes of C4A and C4B
AllotypenPercentAllotypenPercent
A1 0.17 B1 236 40.1 
A12 0.17 B13 0.17 
A2 17 2.89 B2 25 4.25 
A3 274 46.6 B3 0.34 
A4 11 1.87 B6 0.34 
A5 0.51    
A6 15 2.55    
Total 322 54.8 Total 266 45.2 
C4 genotypes
No. of individuals studied150
(No. of chromosome 6)(300)
Total no. of C4 genes present590
Frequency of long C4 genes76.2%
Frequency of short C4 genes23.7%
Phenotypes of C4A and C4B
AllotypenPercentAllotypenPercent
A1 0.17 B1 236 40.1 
A12 0.17 B13 0.17 
A2 17 2.89 B2 25 4.25 
A3 274 46.6 B3 0.34 
A4 11 1.87 B6 0.34 
A5 0.51    
A6 15 2.55    
Total 322 54.8 Total 266 45.2 
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