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Table 1 Distribution of affected offspring among the 263 families

From: Using the maternal-fetal genotype incompatibility test to assess non-inherited maternal HLA-DRB1 antigen coding alleles as rheumatoid arthritis risk factors

No. affected siblings

Families with both parents genotyped

Families with only mothers genotyped

Families with only fathers genotyped

1

6

18

6

2

53

135

25

3

4

12

3

4

0

1

0