A six base deletion in the γchain gene of dysfibrinogen Vlissingen, coding for Asn 319 and Asp 320, resulting in defective interaction with Ca2+ - Koopman, J; Haverkate, F; Lord, S; Caekebeke-Peelinck, K; Brommer, E; Briet, E (Thromb Haemost, 1989)