1. Introductory statement—Why another new journal?

   EditorialNotes Pages: 1 - 2

2. Introduction to this issue—Experimental models of development, function, and neoplasia

   • Daniel Medina
   • Charles Daniel

   EditorialNotes Pages: 3 - 4

3. The mammary gland: A unique organ for the study of development and tumorigenesis

   • Daniel Medina

   OriginalPaper Pages: 5 - 19

4. Role of mesenchymal-epithelial interactions in mammary gland development

   • Gerald R. Cunha
   • Yun Kit Hom

   OriginalPaper Pages: 21 - 35

5. Mammary tumorigenesis and chemoprevention studies in carcinogen-treated rats

   • Clement Ip

   OriginalPaper Pages: 37 - 47

6. Tumor viruses and endogenous retrotransposons in mammary tumorigenesis

   • Bonnie B. Asch

   OriginalPaper Pages: 49 - 60

7. The biology of mammary transgenes: Five rules

   • Robert D. Cardiff

   OriginalPaper Pages: 61 - 73

8. Genetic manipulation of mammary epithelium by transplantation

   • Paul A. W. Edwards
   • Clare L. Abram
   • Jane M. Bradbury

   OriginalPaper Pages: 75 - 89

9. Three-dimensional mammary primary culture model systems

   • Margot M. Ip
   • Kathleen M. Darcy

   OriginalPaper Pages: 91 - 110

10. Human breast cancer cell lines as models of growth regulation and disease progression

    • Stephen P. Ethier

    OriginalPaper Pages: 111 - 121

11. Animal models for the study of milk secretion

    • Colin J. Wilde
    • Walter L. Hurley

    OriginalPaper Pages: 123 - 134

12. Dedication: Clifford W. Welsch

    • Daniel Medina
    • Clement Ip

    Announcement Pages: 135 - 136