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Complex vocalizations measured in Ppid pups . ( A) Distribution of inter-call durations, by genotype and transition category. (B) Distribution of call lengths, by genotype and call category. (C) Principal component (PC) analysis of acoustic features of calls. PC1 versus PC2 and PC3 versus PC4 plotted, coloured by genotype. The first four principal components cumulatively explain 58% of the variance. WT = wild-type.
