epithelial cell proliferation involved in mammary gland duct elongation
The multiplication or reproduction of mammary gland branch epithelial cells, resulting in the elongation of the branch. The mammary gland branch differs from the bud in that it is not the initial curved portion of the outgrowth.
GO:0033598
mammary gland epithelial cell proliferation
is_a
GO:0060751
branch elongation involved in mammary gland duct branching
part_of