What If Humans Could Regrow Tissue? Texas A&M Veterinary Led Study Brings Regeneration a Step Closer

For centuries, the idea that humans could regrow lost limbs or restore complex tissue has belonged firmly to the realm of science fiction. In nature, however, the story is very different. Salamanders can regenerate entire limbs, and certain species can rebuild intricate structures with astonishing precision. Humans, by contrast, heal through scarring—effective for survival, but limiting when it comes to true restoration.

A new study from the Texas A&M College of Veterinary Medicine and Biomedical Sciences is challenging that long-standing biological divide.

Published in Nature Communications, the research demonstrates that mammalian tissue may be more “regenerative” than previously believed. Under the right conditions, scientists were able to guide healing in mice toward the regrowth of bone, joint structures, ligaments, and connective tissue—key components typically lost in amputation injuries.

While the regenerated structures were not perfect replicas of the original anatomy, they were complete in composition, marking a significant step forward in regenerative science.

At the center of this work is Dr. Ken Muneoka of Texas A&M’s Department of Veterinary Physiology & Pharmacology, who has spent much of his career asking a fundamental question: why can some animals regenerate while others cannot?

“This is a big question that has been asked since Aristotle,” Muneoka explained. “I’ve spent my career trying to understand that.”

The answer, it turns out, may not be that mammals lack regenerative ability—but that the body’s default healing response actively suppresses it.

In most mammalian injuries, the body responds with fibrosis: fibroblast cells rapidly close the wound and form scar tissue. It is a highly efficient survival mechanism, but one that effectively locks the body into repair mode rather than regeneration.

In regenerative species like salamanders, those same types of cells behave differently. Instead of forming scars, they organize into a blastema—a temporary, highly adaptable structure that serves as the foundation for rebuilding lost limbs.

Muneoka and his team set out to see whether mammalian cells could be redirected down a similar path.

Their approach used a carefully timed, two-step sequence of growth factors. First, fibroblast growth factor 2 (FGF2) was applied after wound closure, altering the usual healing trajectory. Rather than proceeding directly to scar formation, the tissue began forming a blastema-like structure—an intermediate state not typically seen in mammals.

Several days later, a second signal—bone morphogenetic protein 2 (BMP2)—was introduced. This cue guided the cells to begin constructing new skeletal and connective tissue structures.

“It’s really a two-step process,” Muneoka said. “You first shift the cells away from scarring, and then you provide the signals that tell them what to build.”

What makes this finding especially significant is that it does not rely on introducing external stem cells. Instead, it suggests that the body already contains the necessary cellular machinery for regeneration—it simply needs to be reprogrammed.

“The cells that we thought to be unprogrammable, in fact are,” said Dr. Larry Suva, a collaborator on the study. “The capacity is not absent—it’s just obscured.”

The implications extend beyond limb regeneration. Researchers observed that cells could also be directed to adopt new positional identities, meaning they can be instructed to rebuild structures they would not normally form in that location. This concept, known as positional re-specification, is a key principle in developmental biology and may be essential for future regenerative therapies.

Although the regenerated tissues were not perfectly identical to their original form, they included all expected components at the injury site—bone, tendon, ligament, and joint structures organized in a biologically meaningful way.

“We regenerated what you would expect to see at that level of injury,” Muneoka said. “The structures are there—just not in a perfect form.”

For now, the research remains preclinical, but its potential applications are already drawing attention. Because both BMP2 and FGF2 are either already approved for medical use or under clinical investigation, the pathway toward translational research may be more immediate than many experimental therapies.

In the near term, the greatest impact may not be full limb regeneration, but improved healing outcomes—reducing scarring, improving tissue repair, and shifting how clinicians think about recovery after traumatic injury or amputation.

“Even shifting the response slightly away from scarring could have real benefits,” Muneoka noted.

Ultimately, the study reframes a long-standing assumption in biology: that mammals have lost the ability to regenerate complex structures. Instead, regeneration may not be gone—it may simply be dormant, waiting for the right signals to bring it back online.

As Suva put it, “Once you show that regeneration can be activated, it opens the door to asking entirely new questions.”

For veterinary and medical science alike, those questions may define the next era of healing.