MRC1 and neoplasm: In contrast, at the 24‐h time‐point, 75% of the MHCII labeled macrophages in the tumor were also positive for MRC1 immunolabeling, indicating that in this 24‐h time window, originally M1 macrophages positive for MHCII switched in situ to a M2 phenotype, expressing the MRC1 marker (Fig 3E).