Using SPECT/μCT, we demonstrated that the anti‐MMR Nb‐IMDQ conjugate could accumulate in the tumor in an MMR‐specific fashion and that IMDQ does not alter the in vivo biodistribution of the Nb as compared to previously obtained results.[29, 31] Of note, this is the first demonstration of radioisotope‐labeling of an Nb conjugate. The gene discussed is MRC1; the disease is neoplasm.