Fig. 1From: Transcriptome analysis reveals the genetic basis underlying the seasonal development of keratinized nuptial spines in Leptobrachium boringii Different phenotypes of the keratinized nuptial spines in Leptobrachium boringii during different breeding periods. Male L. boringii grow 10 to 16 nuptial spines on the upper jaw during the breeding period (left), and the spines are sloughed at the post-breeding period (right)Back to article page