Furthermore, with reference to the functional distribution of ES proteins, relevant literature related to myiasis-causing flies, and the nature of W. magnifica parasitism, we choose four specific parasitism-related gene families, including peptidase, cuticle protein, heat shock protein (hsp), and immune response genes, and looked into their expression patterns to gain a better understanding of how the larvae regulate expression of these specific genes to parasitize their hosts. The gene discussed is LAP3; the disease is myiasis.