Watering the Air
Earth-Friendly Fabrics
Seeds of the Future
Frogs and Toads
Poison Dart Frogs
The Secret Lives of Grizzlies
Tool Use Comes Naturally to Crows
Seeing red means danger ahead
A brain-boosting video game
Double take
Chemistry and Materials
The Incredible Shrunken Kids
A Spider's Silky Strength
Bang, Sparkle, Burst, and Boom
Hitting the redo button on evolution
Small but WISE
The science of disappearing
Dinosaurs and Fossils
Dino Babies
Dinosaur Dig
Ferocious Growth Spurts
E Learning Jamaica
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Watering the Air
Riding to Earth's Core
Life under Ice
Lessons from a Lonely Tortoise
A Newspaper's Hidden Cost
Island Extinctions
Finding the Past
Chicken of the Sea
Unearthing Ancient Astronomy
Traces of Ancient Campfires
Hammerhead Sharks
Great White Shark
Food and Nutrition
Yummy bugs
Building a Food Pyramid
Sponges' secret weapon
GSAT English Rules
Capitalization Rules
Who vs. Whom
Adjectives and Adverbs
GSAT Exam Preparation Jamaica
How are students placed after passing the GSAT exam
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT stars reap scholarship glory
GSAT Exams Jamaica Scholarships
Access denied - Disabled boy aces GSAT
Results of GSAT are in schools this week
GSAT Exam Preparation
GSAT Mathematics
Deep-space dancers
Monkeys Count
Play for Science
Human Body
Walking to Exercise the Brain
A New Touch
Tapeworms and Drug Delivery
Giant Squid
Yorkshire Terriers
Raise a Lifelong Reader by Reading Aloud
What Not to Say to Emerging Readers
How children learn
The Mirror Universe of Antimatter
Black Hole Journey
Electric Backpack
Farms sprout in cities
The algae invasion
Bright Blooms That Glow
Box Turtles
Copperhead Snakes
Space and Astronomy
Burst Busters
Solving a Sedna Mystery
Galaxies Divide Sharply Along Color Lines
Technology and Engineering
Bionic Bacteria
Young Scientists Take Flight
Model Plane Flies the Atlantic
The Parts of Speech
Problems with Prepositions
Adjectives and Adverbs
What is a Preposition?
Ready, unplug, drive
Charged cars that would charge
Troubles with Hubble
Science loses out when ice caps melt
Where rivers run uphill
Warmest Year on Record
Add your Article

Return of the Lost Limbs

When people lose legs after accidents or illnesses, emergency care and artificial limbs often allow them to walk again. But salamanders and newts in the same situation don't need doctors or artificial body parts. They can grow limbs back on their own. Scientists have known for a long time that certain animals can regenerate limbs, but they haven't quite figured out how these creatures do it. Researchers from University College London have now come up with some new insights. Their work may lead to breakthroughs that could eventually enable people, too, to regrow lost limbs. The researchers started with two simple observations: When you cut off a newt's leg at the ankle, only the foot grows back. If you cut off a leg at the base, the whole leg grows back. In both cases, the regrowth begins with stem cells . Stem cells are unspecialized cells that can develop into nearly any type of cell in the body. But how do a newt's stem cells know when to regrow only a foot and when to regrow an entire leg? This question relates to another mystery: In newts, a severed leg will grow back only if the bundle of nerves in it also grows back. But if something prevents the nerve bundle from growing, the stem cells at the site of the wound won't multiply to produce a new leg. In its study, the British team zeroed in on a protein called nAG. When the team prevented nerves in a limb from growing, but added the nAG protein to stem cells in the limb, the limb still regrew. The scientists suspect that nerves in the stub of a limb signal the release of the nAG protein. That protein seems to guide limb regrowth. People and other mammals have proteins that are similar to nAG. Further research into these compounds may some day help human limbs and organs heal themselves.—Emily Sohn

Return of the Lost Limbs
Return of the Lost Limbs

Designed and Powered by™