Table I.

Number of observations

Cardiac subregionsNumber of E10.5 hearts with n
 βgal-positive cells in a subregion
5 ≤ n ≤ 40n ≥ 40
Outflow tract197
Right ventricle328
Interventricular region214
Left ventricle3911
Atrioventricular canal93
Body of the atrium64
Right atrium87
Left atrium103
  • Out of 1,155 αc-actin+/nlaacZ1.1 embryos dissected at E10.5. βgal, β-galactosidase.