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 {TAIL ~ amino acid residues} include Ala, {HEAD ~ Gly}, Ile, Leu, Met, Phe, Pro, Trp, Tyr, and Val 
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 { TAIL ~ amino acid residues } include Ala , { HEAD ~ Gly } , Ile , Leu , Met , Phe , Pro , Trp , Tyr , and Val
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