Although animals such as planaria and starfish can regrow virtually any part of their bodies, humans have restricted regenerative capabilities.    From Wordnik.com.  [Media Newswire] Reference

Cut them in two or more pieces, each piece will grow into a perfect planaria again.    From Wordnik.com.  [Country Walks of a Naturalist with His Children] Reference

See, I will place this white planaria on my hand; do you notice that it protrudes something you might perhaps say was its tongue?.    From Wordnik.com.  [Country Walks of a Naturalist with His Children] Reference

Within a year, the presence of RNAi had been documented in many other organisms, including fruit flies, trypanosomes, plants, planaria, hydra and zebrafish27.    From Wordnik.com.  [Advanced Information: The 2006 Nobel Prize in Physiology or Medicine] Reference

Charles Darwin used Werner's Nomenclature of Colors but the only mention of "broccoli-brown" in Voyage of the Beagle is in a description of some kind of planaria.    From Wordnik.com.  [Archive 2008-05-01] Reference

Petersen cut the head, tail or both the head and tail off of planaria and observed where wntP-1 gene expression occurred.    From Wordnik.com.  [Media Newswire] Reference

And then in the 2.5 gallon, we have some planaria, but when they die, we're using it as a live plant area and fry raising tank.    From Wordnik.com.  [Discussion Forum - TuDiabetes - A Community for People Touched by Diabetes] Reference

Although Petersen and Reddien have figured out part of the regeneration process in planaria, the finding is only the beginning.    From Wordnik.com.  [Media Newswire] Reference

This research reveals that planaria are also a great model in which to study the molecular relationship between stem cells and cancer.    From Wordnik.com.  [innovations-report] Reference

Investigating further, Petersen and Reddien found that in planaria with their tails cut off, the wntP-1 gene triggers beta-catenin, which activates the wntP-2 gene.    From Wordnik.com.  [Media Newswire] Reference

(September 14, 2009) - Amputations trigger a molecular response that determines if a head or tail will be regrown in planaria, a flatworm commonly studied for its regenerative capabilities.    From Wordnik.com.  [Media Newswire] Reference

In earlier work with planaria, Petersen and Reddien showed that a Wnt-related gene, called Smed-beta-catenin-1 (beta catenin), is necessary for planaria to regenerate a tail instead of a head after tail amputation.    From Wordnik.com.  [Media Newswire] Reference

This research, conducted with the flatworm planaria, highlights the genetic similarity between these invertebrates and mammals in the mechanisms by which stem cell regulatory pathways are used during adult tissue maintenance and regeneration.    From Wordnik.com.  [innovations-report] Reference

In the journal above alluded to, Dr. Kelaart has given descriptions of fifteen species of planaria, and four of a new genus, instituted by him for the reception of those differing from the normal kinds by some peculiarities which they exhibit in common.    From Wordnik.com.  [Ceylon; an Account of the Island Physical, Historical, and Topographical with Notices of Its Natural History, Antiquities and Productions, Volume 1 (of 2)] Reference

In the journal already mentioned, Dr. Kelaart has given descriptions of fifteen species of planaria, and four of a new genus, instituted by him for the reception of those differing from the normal kinds by some peculiarities which they exhibit in common.    From Wordnik.com.  [Sketches of the Natural History of Ceylon] Reference

These mice can not only close up ear holes, they can partially regenerate things like lost toes, which is something that before we thought only sponges, planaria, and salamanders could do (humans can regenerate some things, like parts of our livers, damaged muscle, etc, but LIMBS are way beyond us).    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

And human beings don't have as much instinct as a planaria. ".    From Wordnik.com.  [Capitol]

Jim, this research—if I’m understanding Ael correctly—had its earliest antecedents on Earth in some very primitive mind experiments concerning planaria.    From Wordnik.com.  [Rihannsu: The Bloodwing Voyages] Reference

There’s an essay – I can’t remember the author now, I think it was in a compilation my mom had called “The Worm Re-Turns” mostly cartoons about planaria.    From Wordnik.com.  [dustbury.com » Sugar-free tablet] Reference

There was plenty to enjoy here, but I’ll single out the beginning of the immortality session as particularly fascinating, as the speaker, Alejandro Sanchez, of the University of Utah described his work on the regenerative properties of planaria (flatworms).    From Wordnik.com.  [Kavli Frontiers of Science Symposium: Election 2008 Edition] Reference

April 2, 2007 at 7:15 pm hoverkitten looks a little bit TOO much like a flatworm there – it’s kinda freakin me out http://www.luc.edu/depts/biology/111/planaria.htm.    From Wordnik.com.  [hoverkitten sez wrrrr - Lolcats 'n' Funny Pictures of Cats - I Can Has Cheezburger?] Reference