Fig. 2. Transmission electron micrographs of the UPy–COOH guest (A), the chol–COOH guest (white arrows indicate relatively large and black arrows indicate small aggregates) (B), and c12–COOH guest (white arrows indicate small aggregates) (C). All guest molecules were measured at a concentration of 50 μM in PBS/DMSO (95/5 v/v%), at a magnification of 240 00× (scale bar represents 200 nm).