... conservation. The hypothesis brings together twofundamental ways of looking at ecosys-tems: who eats what, and how the phys-ical terrain constrains the resident crea-tures. After years of studying ... experiment-ed with the two structures, first oncomputer models, then on the real thing. The researchers removed small stretch-es of amino acids from B-1 that con-tributed to the formation of beta-sheetsand ... retains half of the amino acid sequence of B-1 but has the helical structure of Rop. In more recentwork, the team created Janus II, whichcarries 61 percent of the B-1 sequence,meaning that the researchers...