Table 2.

Embryos treated at HH 14 with either dose of cyclopamine were significantly different from control embryos (p=2.4×10⁻⁸) and each other (p=0.04), as determined with Fisher’s exact test.

Phenotype	Control (n=13)	0.6 μg/μl CPA (n=16)	0.8 μg/μl CPA (n=14)
Hypoplastic pulmonary infundibulum*	0	3	1
Atretic pulmonary outlet*	0	6	3
Stenotic pulmonary ouetlet	0	2	0
Persistent truncus arteriosus	0	2	6
Unidentifiable single outlet	0	1	1
Normal	13	2	3

^*Both of these phenotypes were classified as pulmonary atresia based on the absence of a pulmonary artery.