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More information on the genetic screen to identify regeneration genes; YouTube videos: Planaria eating worm segment, Planarian; Schmidtea mediterranea, facts, anatomy, image at GeoChemBio.com; Alejandro Sanchez-Alvarado's Seminar: Regeneration in Planarians; Link to an article discussing some work on planarian immortality
Morgan found that a piece corresponding to 1/279th of a planarian [11] or a fragment with as few as 10,000 cells could regenerate into a new worm within one to two weeks. [13] Morgan also found that if both the head and the tail were cut off a flatworm the middle segment would regenerate a head from the former anterior end and a tail from the ...
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Almost any piece from a Schmidtea mediterranea individual can regenerate an entire organism in a few days. [5] This is in part enabled by the presence of abundant pluripotent stem cells [9] called neoblasts.
Planaria is a genus of planarians in the family Planariidae. Due to its excellent ability to regenerate, species of Planaria has also been used as model organisms in regeneration studies. [ 1 ] When an individual is cut into pieces, each piece has the ability to regenerate into a fully formed individual. [ 2 ]
Epimorphosis is defined as the regeneration of a specific part of an organism in a way that involves extensive cell proliferation of somatic stem cells, [1] dedifferentiation, and reformation, [2] as well as blastema formation. [3]
Here is an example mechanism of what happens during neoblast specification during regeneration. As stated above, there are several different types of organisms that can utilize a regenerative blastema as an adult. These organisms include urodele amphibians, zebrafish, and planarian flatworms as major creatures of study.
Memory transfer was a biological process proposed by James V. McConnell and others in the 1960s. Memory transfer proposes a chemical basis for memory termed memory RNA which can be passed down through flesh instead of an intact nervous system.