Planarians are bilaterian flatworms that lack a fluid-filled body cavity, and the space between their organ systems is filled with parenchyma. [5][13] Planarians lack a circulatory system, and absorb oxygen through their body wall. They uptake food to their gut using a muscular pharynx, and nutrients diffuse to internal tissues.

Parián or Pantin, also Parián de Arroceros was an area adjacent to Intramuros at its east built to house Sangley (Chinese) merchants in Manila in the 16th and 17th centuries during the Spanish rule in the Philippines. [1] .

Parian or Parián may refer to: Pertaining to Paros, the Greek island: Parian marble, a stone quarried on Paros used for sculpture; Parian ware, a ceramic substitute for marble which was fashionable in Victorian England; Parian doll, a type of doll manufactured primarily in Germany, from around 1860 to 1880

planarian, (class Turbellaria), any of a group of widely distributed, mostly free-living flatworms of the class Turbellaria (phylum Platyhelminthes). Planaria is the name of one genus, but the name planarian is used to designate any member of the family Planariidae and related families.

Planaria or Planarians (singular: Planarian) are also called “cross-eyed worms”. They are a group of tiny flatworms belonging to the phylum of Platyhelminthes. They are free-living organisms and widely distributed in all kinds of freshwater habits. [In this image] Planarian, a tiny flatworm, viewed under a microscope.

Feb 6, 2025 · The lab of Whitehead Institute Member Peter Reddien describes how planarians use the Delta-Notch signaling pathway to adjust the spatial pattern and relative numbers of neurons and glia at a given location. This allows the organisms to restore large portions of their nervous system following injury.

1 day ago · Are Planarian Worms Immortal? Unraveling the Secrets of Regeneration. The answer, while complex, leans towards a fascinating “yes, but with caveats.”

1 day ago · Establishment of a pharmacological approach for time-resolved cWnt gradient manipulations. If the cWnt gradient were indeed a polarity cue, then the experimental flattening of the gradient prior to amputation should reduce the difference in signalling activity between the two wounds and thus affect head/tail regeneration specificity.

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Planarians are flatworms capable of dramatic feats of regeneration, which have been studied for over two centuries. Recent findings identify key cellular and molecular principles underlying these feats.