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زیست شناسی::
کرم پهن
Stem Cell-Mediated Regeneration in Flatworms
Planarian flatworms can reproduce asexually by binary fission, during which they split themselves in half, separating their posterior end from the anterior end, and each segment regenerates the lost parts.
Morgan pointed out that if both the head and the tail were cut off a flatworm, thus trisecting the animal, the medial segment would regenerate a head from the former anterior end and a tail from the former posterior end, but never the reverse (FIGURE 22.9C).
{A} Neoblasts in the planarian flatworm Schmidtea mediterranea, stained with antibodies to phosphorylated histone
Each pluripotent neoblast generates a colony of neoblast cells (red; nuclei are stained blue) in the flatworm.
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