- Parental somatic and germ-line mosaicism for a multiexon deletion with unusual endpoints in a type III collagen (COL3A1) allele produces Ehlers-Danlos syndrome type IV in the heterozygous offspring. Milewicz, D.M., Witz, A.M., Smith, A.C., Manchester, D.K., Waldstein, G., Byers, P.H. Am. J. Hum. Genet. (1993)