Result of gel electrophoresis for genomic DNA a HMW genomic DNA is visible in all samples. There is more DNA degradation in formalin-fixed samples. b Formalin-fixed samples do not show uniform strong smear after linear amplification. c PCR for GAPDH shows a 450 bp amplicon in all samples with a lesser intensity in formalin-fixed samples, L ladder (numbers indicate bp), S fresh control in saline, U UMFIX, F formalin, P positive control, N negative control