pleated sheet

Beta sheets consist of beta strands (also [beta]-strand) connected laterally by at least two or three backbone hydrogen bonds, forming a generally twisted, pleated sheet. A P-strand is a stretch of polypeptide chain typically 3 to 10 amino acids long with backbone in an extended conformation.

Then cover with a pleated sheet of tin foil and secure with string.

Typically, weak interactions between hydrogen atoms of adjacent strands stabilize the strands into a pleated sheet. In this peptide, the zigzags place alanine only at the tops of a zig and all the charged amino acids at the bottom of a zag.