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Figure 3 (A) Twin 1 of sib pair 1 (patient 27 in tables 3 and 4), who died shortly after birth; (B) twin 2 of sib pair 1 (patient 26 in tables 3 and 4) at the age of 7 years; (C) sib 1 and (D) sib 2 of sib pair 2, both at the age of 2 years (patients 29 and 30 in tables 3 and 4). (Written consent was obtained for publication of these photographs.)
