Opportunities for Advancing Limb Regeneration Research (R01 Clinical Trial Not Allowed) | RFA HD 24 004

Opportunity Information: Apply for RFA HD 24 004

The National Institutes of Health (NIH) funding opportunity titled "Opportunities for Advancing Limb Regeneration Research (R01 Clinical Trial Not Allowed)" (RFA-HD-24-004) is designed to push forward transformative basic research aimed at understanding and enabling limb regeneration. The emphasis is on studies that use animal models to uncover how the body naturally controls growth, patterning, and tissue rebuilding, and how those internal regulatory networks might be safely and effectively manipulated to promote regeneration in vertebrates. A central scientific motivation behind the announcement is that many vertebrates, especially mammals, have limited innate ability to regenerate complex limb structures. This FOA seeks projects that can clarify what is missing or constrained in those systems and identify strategies that could unlock more robust regenerative responses.

The FOA is explicitly basic-research focused and is not intended to support clinical trials. In practical terms, applicants are expected to propose mechanistic, discovery-driven work rather than human interventional studies. The goal is to generate foundational knowledge about the molecular, cellular, developmental, and systems-level processes that govern limb regrowth, with an eye toward translating that knowledge into future therapeutic directions. The long-term vision is to improve outcomes for people with developmental limb deficiencies and to address challenges associated with limb injury and amputation. Importantly, the FOA frames impact in both near-term and long-term horizons, meaning projects may range from identifying key pathways and cell populations to establishing enabling tools, models, and experimental approaches that lay the groundwork for later translational advances.

This opportunity uses the NIH R01 mechanism, indicating support for substantial, hypothesis-driven research programs that can deliver significant advances in understanding. The award ceiling listed is $499,999, and the original application closing date was 2023-07-27 (as provided in the source data). The opportunity is categorized under Health, Income Security and Social Services and is associated with CFDA number 93.865.

Eligibility is broad across U.S.-based organizations and includes state, county, city/township, and special district governments; independent school districts; public and state-controlled institutions of higher education; private institutions of higher education; federally recognized Native American tribal governments; and Native American tribal organizations other than federally recognized tribal governments. It also includes public housing authorities/Indian housing authorities, nonprofits with or without 501(c)(3) status (other than institutions of higher education), for-profit organizations other than small businesses, small businesses, and other eligible entities. The FOA also highlights additional eligible applicant types such as Alaska Native and Native Hawaiian Serving Institutions, Asian American Native American Pacific Islander Serving Institutions (AANAPISI), Hispanic-serving Institutions, Historically Black Colleges and Universities (HBCUs), Tribally Controlled Colleges and Universities (TCCUs), faith-based or community-based organizations, regional organizations, eligible federal agencies, Indian/Native American Tribal Governments other than federally recognized, and U.S. territories or possessions.

At the same time, there are clear limitations related to foreign involvement. Non-domestic (non-U.S.) entities and non-domestic (non-U.S.) institutions are not eligible to apply, and non-domestic components of U.S. organizations are also not eligible to apply. However, foreign components, as defined in the NIH Grants Policy Statement, are allowed, which typically means a U.S. applicant organization may include certain defined foreign collaborations or activities when appropriately justified and compliant with NIH policy.

Overall, the FOA is aimed at accelerating the field of limb regeneration by funding rigorous, imaginative animal-model research that explains how regenerative capacity is controlled and how it might be enhanced, including in mammalian contexts where regeneration is usually limited. The expected payoff is a stronger scientific foundation for eventual strategies that could help prevent, repair, or functionally restore limbs affected by congenital differences, trauma, or amputation.

• The National Institutes of Health in the health, income security and social services sector is offering a public funding opportunity titled "Opportunities for Advancing Limb Regeneration Research (R01 Clinical Trial Not Allowed)" and is now available to receive applicants.
• Interested and eligible applicants and submit their applications by referencing the CFDA number(s): 93.865.
• This funding opportunity was created on 2022-11-28.
• Applicants must submit their applications by 2023-07-27. (Agency may still review applications by suitable applicants for the remaining/unused allocated funding in 2026.)
• Each selected applicant is eligible to receive up to $499,999.00 in funding.
• Eligible applicants include: State governments, County governments, City or township governments, Special district governments, Independent school districts, Public and State controlled institutions of higher education, Native American tribal governments (Federally recognized), Public housing authorities/Indian housing authorities, Native American tribal organizations (other than Federally recognized tribal governments), Nonprofits having a 501 (c) (3) status with the IRS, other than institutions of higher education, Nonprofits that do not have a 501 (c) (3) status with the IRS, other than institutions of higher education, Private institutions of higher education, For-profit organizations other than small businesses, Small businesses, Others.

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