Tetrapod limb development has been studied extensively for decades, yet the strength and role of developmental constraints in this process remains unresolved. Mammals exhibit a particularly wide array
Camera lucida sketches of the zebrafish embryo at selected stages. This image is from the Segmentation period at the 19.5 hour 21 somite stage.The animal pole is to the top for the early stages, and a
Camera lucida sketches of the zebrafish embryo at selected stages. This image is in the Blastula period at the 3.75 hour oblong stage. The animal pole is to the top for the early stages, and anterior
Camera lucida sketches of the zebrafish embryo at selected stages. This image is in the Blastula period at the 4 hour sphere stage. The animal pole is to the top for the early stages, and anterior is
Additional file 3: Table S1. Phylogenetic signal. Results of phylogenetic signal estimations using D statistics and Pagel's lambda, and the comparison of the observed number of evolutionary transition
