highly significantP = 4 × 10 −8
There was a strong and highly significant difference in copy number (estimated from the qRTPCR) among the groups identified by TaqMan and ddPCR (ANOVA: F 4,38 = 18.4, P = 4 × 10 −8 ) with a progressive increase from a single-copy average for susceptible homozygotes (Gn), suggesting that all or most are unduplicated, to resistant homozygotes (Sn) which averaged in excess of four gene copies (Fig. 6 ).