Case 1. The elder of two sibs, this boy was born on May 21, 1965 to unrelated healthy parents aged 29 (mother) and 30 years (father). Birthweight was 2820 g.; delivery was by forceps. His mother had 'influenza' between the fifth and sixth months of the pregnancy which had been otherwise normal. There was no previous foetal loss. Four generations of the family, comprising, in addition to the par...
