A unidirectional calcium wave arising form the left side. The wave originates from a hot spot on the left side of the blastoderm margin and intensifies while crossing the node region. This sequence ...

Camera lucida sketches of the zebrafish embryo at selected stages. This image is in the Zygote period at the 0.2 hour 1 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. This image is in the Cleavage period at the 2 hour 64 cell stage. The animal pole is to the top for the early stages, and anterior i...

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 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 Gastrula period at the 5.7 hour germ ring stage. The animal pole is to the top for the early stages, and anterio...

Camera lucida sketches of the zebrafish embryo at selected stages. This image is in the Segmentation period at the 11 hour 3 somite 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 Segmentation period at the 16 hour 14 somite stage. The animal pole is to the top for the early stages, and ante...

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...