| http://www.w3.org/ns/prov#value | - is a Pro, or Ser; Xaa(9) is an Asn, or Ser; Xaa(10)is a Pro, or Ser; Xaa(11) is an Arg, or Lys; Xaa(12) is a Pro, or Ser.Further expansion of the combinatorial library can be made, for example, by including amino acids which would represent conservative mutations at one or more of the degenerative positions of the aligned variants.
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