Camera lucida sketches of the zebrafish embryo at selected stages. This image is from the Segmentation period at the 22 hour 26 somite stage. The animal pole is to the top for the early stages, and an...

Camera lucida sketches of the zebrafish embryo at selected stages. This image is from the Pharyngula period at the 35 hour Prim-22 stage. The animal pole is to the top for the early stages, and anteri...

Camera lucida sketches of the zebrafish embryo at selected stages. This image is from the Pharyngula period at the 42 hour high pec stage. The animal pole is to the top for the early stages, and anter...

This movie shows the "yolk flash". The apparently whole-embryo calcium pulse appears to initiate over a widespread area of blastoderm, possibly earliest at the animal pole, and then spreads first to ...

Camera lucida sketches of the zebrafish embryo at selected stages. This image is in the Cleavage period at the 0.75 hour 2 cell 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 Cleavage period at the 1 hour 4 cell stage. The animal pole is to the top for the early stages, and anterior is ...

Camera lucida sketches of the zebrafish embryo at selected stages. The animal pole is to the top for the early stages, and anterior is to the top later, except for the two animal polar (AP) views show...

Camera lucida sketches of the zebrafish embryo at selected stages. The animal pole is to the top for the early stages, and anterior is to the top later, except for the two animal polar (AP) views show...

Camera lucida sketches of the zebrafish embryo at selected stages. This image is in the Blastula period at the 4.7 hour 30% epiboly stage. The animal pole is to the top for the early stages, and anter...

Camera lucida sketches of the zebrafish embryo at selected stages. This image is in the Gastrula period at the 8 hour 75% epiboly stage. The animal pole is to the top for the early stages, and anterio...