Transplanted cultured cells from pregnancy‐dependent mammary tumors have a heterogenous developmental potential

Abstract
Cultured cells derived from pregnancy‐dependent mouse mammary tumors (plaques) when transplanted into the gland‐free mammary fat pad display a heterogeneous developmental potential. They not only gave rise to plaques but also produced normal mammary gland, hyperplastic alvoelar nodules (HAN), and autonomous mammary tumors.