| CPC C40B 40/08 (2013.01) [C12N 15/1037 (2013.01); C12N 15/1072 (2013.01)] | 30 Claims |

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1. A peptide expression library composition comprising:
a) a library of nucleic acid sequences encoding a library of peptides;
b) one or more control vectors comprising:
1) A nucleic acid sequence encoding a control binding target of a control binding molecule, wherein the control binding target is identical for each of the control vectors, and
2) A unique nucleic acid sequence, wherein the unique nucleic acid sequence is specific for each of the control vectors.
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