Figure 5. Prenatal diagnosis of the inherited duplication. Gels of amplification products are shown. Lanes 1 and 6 are a negative control. Lanes 2 and 5 are the positive control, III-5. Lanes 3 and 4 show two dilutions of the CVS material for IV-9. Lanes 7 and 8 show two dilutions of the CVS material for IV-10. M is the molecular weight marker, a HpaII digest of pUC19. IV-9 has the insertion band and IV-10 has only the normal band.