Embryos travel forking path as they tell left from right.
Roush
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D029404:Activin Receptors; D028341:Activins; D000818:Animals; D002642:Chick Embryo; D004627:Embryonic Induction / Q000235:genetics*; D018507:Gene Expression Regulation, Developmental; D006321:Heart / Q000196:embryology*; D053823:Hedgehog Proteins; D007265:Inhibins / Q000494:pharmacology; D011506:Proteins / Q000235:genetics; D017978:Receptors, Growth Factor / Q000235:genetics; D015534:Trans-Activators
D053823:Hedgehog Proteins; D011506:Proteins; D017978:Receptors, Growth Factor; D015534:Trans-Activators; D028341:Activins; D007265:Inhibins; D029404:Activin Receptors