title: Letter: Research, serendipity, and emperipolesis.
mesh_terms: D002462:Cell Membrane; D006801:Humans; D007948:Leukemia, Monocytic, Acute / Q000097:blood / Q000473:pathology*; D008214:Lymphocytes / Q000276:immunology; D008854:Microscopy, Electron; D009369:Neoplasms / Q000473:pathology*