Fig 1. Ribbon diagrams of the Cyp/CsA/Cn ternary complex
(A), and the FKBP/FK506/Cn complex (B) (2, 3). CsA and FK506 are
shown in ball-and-stick representations; CnA is in yellow (with
the CnB-binding segment in dark yellow); CnB, red; Cyp, green;
FKBP, blue; and Ca^2+ ions, cyan balls. The Cn active-site cleft
is indicated with an asterisk.