Fig. 2
From: 99m-Technetium binding site in bone marrow mononuclear cells
Distribution of 99m-technetium radioactivity in bone marrow mononuclear subcellular fractions. Pellet I: nucleus, cells that were not lysed, and large fragments of plasma membrane; pellet II: mainly mitochondria, liposomes, and peroxisomes; pellet III: microsomal fraction (endoplasmic reticulum and plasma membrane fragments); supernatant III: cytoplasm, ribosomes unbound to membrane, and soluble molecules