The IVISbrite™ 4T1 Red F-luc tumor cell line (Bioware® Brite 4T1-Red-FLuc) is a light-producing cell line derived from 4T1 mouse mammary gland adenocarcinoma. The cells have been stably transduced with the red-shifted firefly luciferase gene from Luciola Italica (Red F-luc), for a brighter, red-shifted signal.