Table 1.
Pseudoglandular stage (~E14) | Canalicular stage (~E14-16) | Terminal bud stage (~E16-18) | |||
---|---|---|---|---|---|
Early | Late | Early | Late | ||
Terminal bud | − | − | +C, (M) | ||
Epithelial stalk | − | ||||
Presumptive duct | − | − | |||
Pro-acini | +C, M | +A, L(C) | |||
Juxta-acinar cells | +A | +A | |||
Intralobular duct | − | +A | |||
Interlobular duct | − | − |
− negative staining, + positive staining, C cytoplasmic staining, M membrane staining, A apical staining, L lateral staining, () weak staining, empty slots: structure not present