PROS1 and colorectal carcinoma: When probing surface proteins with specific antibodies in established CIC structures without cell permeabilization, we found that regions of the engulfed inner vector‐expressing MSI‐H CRC cells were not labeled with anti‐EPCAM antibody (Fig. 3I and Fig. S6A, left), anti‐EGFR antibody (Fig. S6B), anti‐CD47 antibody (Fig. 3J and Fig. S6A, right), or anti‐PD‐L1 antibody (Fig. S6C).