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Morphological characteristics of Gnathostoma larvae: (A) advanced third-stage larvae (AL3) of Gnathostoma binucleatum, (B, C) encysted AL3 larva in the muscle of freshwater fish, and (D) characteristic cephalic region of Gnathostoma spp. covered by transverse rows of cuticular spines and the adjacent body covered with transverse rows of flat spines.
