PTHLH and neoplasm: To generate mice in which the mammary epithelium-expressing membrane-targeted GFP is highlighted against the membrane-targeted red fluorescent backlight of stromal and nonepithelial-derived mammary gland tissues, we used our previously generated strains, including Pthrpwt/wt; Cre+ tumor-free (PTHrP WT tumor-free), Pthrpwt/wt; Cre+ tumor (PTHrP WT tumor), Pthrpflox/flox; Cre+ tumor-free (PTHrP KO tumor-free), and Pthrpflox/flox; Cre+ tumor (PTHrP KO tumor), that were crossed with mTmG mice.