Embryo Polarity and Pattern Formation 14 Embryo Polarity and Pattern Formation
Polarity of the frog zygote
Importance of the gray crescent in frog development
Cleavage of the zygote of the sea snail, Ilyanassa
Experimental separation of cells after the 3rd cleavage in a sea urchin embryo
Spemann’s experimental transplantation of the gray crescent
Spemann’s experimental transplantation of the gray crescent
Development of vertebrate optic vesicles and their induction of lenses
Mammalian eye development
Mammalian eye development
Mammalian eye development
Amphibian gonad differentiation: undifferentiated gonad presumptive ovarian tissue presumptive testicular tissue mature ovary mature testis
Homo sapiens genitalia differentiation
Homophilic binding of cell-adhesion proteins
A model of cell migration
Somite formation just prior to nerulation (cross section)
Somite formation just prior to nerulation (longitudinal section)
Model of morphogen concentration gradients in Drosophila differentiation of segmentation
Drosophila larval imaginal discs for corresponding adult appendages
A homeobox mutation in Drosophila
A homeobox mutation in Drosophila
Pattern formation in development of chick (Gallus gallus) wing
Pattern formation in development of chick (Gallus gallus) wing
Control development of chick (Gallus gallus) wing
Experimental grafting of progress zone in development of chick (Gallus gallus) wing
Experiment with a transplanted polarizing region
Control development of chick (Gallus gallus) wing
Regeneration of salamander arm
Migration of nerve cells
Growth cone of developing axon in grasshopper
Cell death (apoptosis) during the formation of nematode ganglion Precursor 12 2 4 6 8 10 12 migration mitosis Time (hours) x x x a b c d e S1 S2