Side-branching in the mammary gland: the progesterone-Wnt connection.

@article{Robinson2000SidebranchingIT,
  title={Side-branching in the mammary gland: the progesterone-Wnt connection.},
  author={Gertraud W. Robinson and Lothar Hennighausen and Peter F. Johnson},
  journal={Genes \& development},
  year={2000},
  volume={14 8},
  pages={
          889-94
        }
}
The mammary gland is a derivative of the ectoderm whose development begins in the embryo and progresses after birth. The major part of development occurs in the adolescent and adult animal. Hormones produced by the pituitary, the ovaries, the uterus, the placenta, and the mammary gland itself control this process. Over the past century, surgical, biological, and genetic tools have been used to gain insight into physiological and pathological processes in the mammary gland. Originally, endocrine… 

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