Wire Frame

Cartoon

Thrombin - Spacefill White, Hirudin - Spacefill red

Thrombin - Spacefill White, Hirudin - Wireframe red

Thrombin - White Surface, Hirudin - Wireframe red

Thrombin - White Surface, Hirudin - Spacefill red

Ser - His - Asp active site  (tube)
Note the location of the Ser OH proximal to the amide bound in the inhibitor