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The blade runs across the top and a probe will suck out the allantoic fluid, the liquid near the edge of the shell, and that is effectively a version of the flu virus.

A crystalline, transparent, colorless substance found in the allantoic liquid of the fetal calf; Ð formerly called allantoic acid and amniotic acid.

Observe the allantoic bladder, the spleen, gall bladder, portal vein, and pancreas.

Cenogenetic processes, on the other hand, include such phenomena as the formation of yolk and the embryonic membranes, the temporary allantoic circulation, the navel, the curved and contracted shape of the embryo, and the like.

Immediately surrounding it is the liquor amnii, and within allantois is the allantoic fluid.