Fig. (1) Structure of CSD. The association of caveolin-1 (thick black line) with membranes (parallel lines) is shown. Note that CSD is found at the surface of the membrane about midway between the N-terminal (N) and C-terminal (C) ends of caveolin-1. The combined amino acid sequence of the Antennapedia internalization sequence (Antennapedia) which carries CSD across membranes and into cells and of CSD is shown in single-letter code.