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Frontal view of wild-type (left) and mutant pollywog
embryos one day after fertilization. The eyes in the
mutant embryo are widely spaced and embedded in the
yolk.

Four days after fertilization wild-type embryos (left)
exhibit developed pectoral fins and widely spaced eyes,
whereas strongly affected pug mutants lack pectoral
fins and display narrow-set eyes.

A bank of zebrafish tanks in the Mullins wet laboratory
that are used in breeding experiments
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