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Beta sheet
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===Psi-loop motif=== The psi-loop (Ξ¨-loop) motif consists of two antiparallel strands with one strand in between that is connected to both by hydrogen bonds.<ref>{{cite journal | vauthors = Hutchinson EG, Thornton JM | title = PROMOTIF--a program to identify and analyze structural motifs in proteins | journal = Protein Science | volume = 5 | issue = 2 | pages = 212β20 | date = February 1996 | pmid = 8745398 | pmc = 2143354 | doi = 10.1002/pro.5560050204 }}</ref> There are four possible strand topologies for single Ξ¨-loops.<ref name="pmid2281084">{{cite journal | vauthors = Hutchinson EG, Thornton JM | title = HERA--a program to draw schematic diagrams of protein secondary structures | journal = Proteins | volume = 8 | issue = 3 | pages = 203β12 | year = 1990 | pmid = 2281084 | doi = 10.1002/prot.340080303 | s2cid = 28921557 }}</ref> This motif is rare as the process resulting in its formation seems unlikely to occur during protein folding. The Ξ¨-loop was first identified in the [[aspartic acid protease|aspartic protease]] family.<ref name="pmid2281084"/>
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