Expressions such as “” means the sum of the molar ratios of Xaa1 and Xaa2, etc. Xaa1 and Xaa2 are, independently, residues having hydrophobic sidechains Exemplary naturally occurring {HEAD ~ amino acid residues} include {TAIL ~ Ala}, Gly, Ile, Leu, Met, Phe, Pro, Trp, Tyr, and Val 
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Expressions such as “ ” means the sum of the molar ratios of Xaa1 and Xaa2 , etc . Xaa1 and Xaa2 are , independently , residues having hydrophobic sidechains Exemplary naturally occurring { HEAD ~ amino acid residues } include { TAIL ~ Ala } , Gly , Ile , Leu , Met , Phe , Pro , Trp , Tyr , and Val
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