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Pigments cells respond to hormones: African clawed frog

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African Clawed Frog / Liz West / LicenseCC-by-nc - Attribution Non-commercial

Pigments in frog skin change color in response to hormones by moving melanin grains around cells.

BIOMIMICRY TAXONOMY
Summary
"Some frogs, such as the African clawed frog (Xenopus laevis), change colour to cope with sunlight and heat and also to improve their camouflage. They do this by activating cells in their skin that contain granules of melanin, the dark brown pigment. These colour-changing cells, called melanophores, are normally dark but can be triggered by a particular hormone released in the frog. When the hormone binds to the cell wall, it sets off a reaction that moves the pigment granules to the centre of the cell, making it look colourless. Once the hormone detaches, the melanin grains disperse throughout the cell, making it appear dark again." (Sample 2002:21)
About the inspiring organism
African Clawed Frog
Xenopus laevis (Daudin, 1802)
Common name: African clawed frog

Habitat(s): Artificial - Aquatic, Artificial - Terrestrial, Forest, Grassland, Savanna, Shrubland, Wetlands
Learn more at EOL.org
Some organism data provided by: ITIS: The Integrated Taxonomic Information System
Organism/taxonomy data provided by:
Species 2000 & ITIS Catalogue of Life: 2008 Annual Checklist

Threat Categories LONG_LC IUCN Red List Status: Least Concern

Bioinspired products and application ideas

Application Ideas: Could be used to detect drugs, other chemicals, (but through mimicking the action of the pigments rather than harvesting melanophores or skin cells from the frogs). Non-toxic and biodegradable video screens for everything from iPods and cell phones to computers and large screen TVs. Food packaging that signals presence of microbial contamination.

Industrial Sector(s) interested in this strategy: Medical, electronics, food

References
Sample, I. 2002. Amphibian detectives. New Scientist. 173(2332): 21.
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Karlsson AM; Bjuhr K; Testorf M; ÷berg Pk; Lerner E; Lundström I; Svensson SPS. 2002. Biosensing of opioids using frog melanophores. Biosensors and Bioelectronics. 17(4): 331-335.
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