CCR1 and colorectal carcinoma: Before injection of the CRC cells into the spleen, we found only ~0.2 % of the recovered liver resident cells to be propidium iodide (PI)− and CD45+ live hematopoietic cells, and only ~5 % of them were Ccr1-mVenus+ with their majority being Gr-1+ (Fig. 2c, Day 0).