Updated project metadata. Erythrocyte-derived systems offer a potential platform for delivering biomedical cargos. Although the importance of specific proteins associated with biodistribution and pharmacokinetics of these particles has been recognized, it remains to be explored whether some of the key transmembrane and cytoskeletal proteins, responsible for immune-modulatory effects and mechanical integrity of the particles, are retained. Herein, the main objective of our project is to examine the proteomes of micro- and nano-sized erythrocyte ghosts doped with near-infrared agent, indocyanine green, and compare them with those of native red blood cells (RBCs). Our findings highlight the importance of engineering methods in fabricating erythrocyte-based systems with appropriate proteomics for ultimate clinical applications.