Fig 1. Schematic diagram of general salivary gland structure.

Secretory acinar cells are arranged in clusters, known as acini, which produce primary saliva. The smallest intercalated ducts conduct saliva from the acini to the striated, and excretory ducts. Sites of inducible Cre drivers are indicated, color-coded for each strain. Dcpp1, gene encoding demilune cell and parotid protein; Pip, gene encoding prolactin-inducible protein; Tcf, gene encoding Tcfcp2l1 transcription factor.