UC Berkeley MPI Data. (A) First in vivo tracking of stem cells using MPI, which has zero signal attenuation with depth and zero background signal (reproduced from 22 under creative common license). (B) First in vivo MPI images of triple negative breast cancer (Reproduced with permission from Yu E et al, 2 Copyright 2017 American Chemical Society) (C) First in vivo MPI study of gastrointestinal bleed assessment in a murine model, akin to Tc99m-RBC scans but without radiation (Adapted with permission from Yu E et al, 47 Copyright 2017 American Chemical Society) with 10-times greater sensitivity than RBC scintigraphy. (D) Monoclonal IgG-antibody functionalized SPIO MPI scan showing distribution of in situ labeled WBCs in the RES system of liver, spleen and marrow.