Gross morphology of mouse embryos derived from Mrad1+/- × Mrad1+/- crosses. A, PCR genotyping of Mrad1 in mice. Yolk sac genomic DNA was used as template. B, Representative gross morphology of Mrad1 mouse embryos at E6.5, E7.5 and E10.5. A complete liter of embryos at each stage are presented. +/+, Mrad1+/+; +/-, Mrad1+/-; -/-, Mrad1-/-.