1. A recombinant nucleic acid molecule comprising a polynucleotide sequence encoding an affinity molecule comprising a first single domain antibody comprising the complementarity determining region 1 (CDR1) amino acid sequence of SEQ ID NO: 138, the complementarity determining region 2 (CDR2) amino acid sequence of SEQ ID NO: 139, and the complementarity determining region 3 (CDR3) amino acid sequence of SEQ ID NO: 140 or 141, wherein the affinity molecule binds an insect gut nutrient amino acid transporter protein.
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