The definitive host becomes infected when it ingests the cyst-containing organs of the infected intermediate host, following which protoscolices evaginate and attach to the intestinal mucosa of the definitive host before they develop into adult stages in 32-80 days.
In some individuals, an accessory pancreatic duct (of Santorini) is present, a vestige of the pancreas origin (torn two embryonic endodermal primordia that evaginate from the foregut.
Before forming the optic vesicle at 12 hpf, the eye field begins to evaginate and the fluorescence significantly appears in the epidermis layer (Figure 1(d)).
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