Vertebrate Animals Section (VAS)

The Vertebrate Animals Section (VAS) is a required, narrative component of an NIH grant application or cooperative-agreement proposal whenever the proposed research involves live vertebrate animals. It sits alongside the rest of the application (Research Strategy, budget, biosketches) as its own uploaded attachment, and NIH Scientific Review Groups (SRGs, i.e. study sections) evaluate it as part of scientific and technical merit review — a missing or inadequate VAS can get an otherwise fundable application deferred from that review round rather than scored. The VAS is distinct from, and does not substitute for, Institutional Animal Care and Use Committee (IACUC) protocol approval: NIH requires VAS content at the time of application, and separately requires IACUC approval and an active PHS Assurance before it will release funds, per PHS Policy.

What the VAS requires

NIH’s original guidance on the VAS, NOT-OD-10-027 (2010), directed applicants and reviewers to five points: (1) a description of the proposed procedures and the species, strains, ages, sex, and numbers of animals; (2) justification for the use of animals and for the appropriateness of the species and numbers proposed; (3) adequacy of veterinary care; (4) procedures for limiting pain, distress, and injury to what is unavoidable in scientifically sound research; and (5) the method of euthanasia and whether it is consistent with the recommendations of the AVMA Guidelines for the Euthanasia of Animals.

NIH simplified the VAS narrative in 2016 via NOT-OD-16-006, consolidating the required write-up into four narrative elements that still cover the same substantive ground reviewers assess:

• Description of procedures — a concise account of what will be done to the animals, plus species, strains, ages, sex, and total number of animals by species.
• Justification — why the species is appropriate for the proposed research, and why the research goals cannot be accomplished with a non-animal or lower-vertebrate alternative (e.g. computational modeling, in vitro assay, invertebrate model).
• Minimization of pain and distress — the interventions used, including analgesia, anesthesia, sedation, palliative care, and humane endpoints.
• Euthanasia — a statement of whether the method is consistent with the current AVMA Guidelines for the Euthanasia of Animals; if not, a scientific justification for the deviation.

Adequacy of veterinary care is still required of the institution under PHS Policy and Animal Welfare Act regulations — it is verified through the institution’s IACUC and PHS Assurance rather than re-justified as a separate VAS narrative point after the 2016 simplification.

When a VAS is required

A VAS is triggered by any proposed use of a live vertebrate animal in NIH-supported research, testing, or training — the same “live vertebrate animal” scope that PHS Policy uses, which is broader than the Animal Welfare Act (AWA)‘s statutory definition (the AWA excludes purpose-bred laboratory rats, mice, and birds; PHS Policy does not). This applies across NIH mechanisms — R-series research grants, K-series career awards, U-series cooperative agreements, and contracts — whenever the Research Strategy proposes live-animal work, not only on applications with an explicit “animal subjects” checkbox.

Consequences of an incomplete VAS

NIH guidance is explicit that an application lacking a required VAS, or one that fails to address all the required points, may be designated incomplete and returned or deferred from the current review cycle, or may negatively affect the application’s overall impact/priority score at review. This is separate from, and precedes, the institution’s own IACUC protocol-approval and PHS Assurance verification, which NIH checks before issuing a Notice of Award rather than before peer review.

Examples

Example 1. An R01 application proposing survival surgery in mice to study a metabolic disease includes a VAS that: describes the surgical and post-operative monitoring procedures; specifies C57BL/6 mice, adult, both sexes, with a total planned number justified against the study’s statistical power calculation; explains why an in vitro cell-culture model cannot answer the proposed in vivo physiological question; describes a post-surgical analgesia protocol; and states that the planned euthanasia method (CO2 inhalation followed by a secondary physical method) is consistent with the AVMA Guidelines for the Euthanasia of Animals.

Example 2. A K99/R00 application proposing zebrafish behavioral assays includes a VAS justifying zebrafish as an appropriate model for high-throughput screening relative to a mammalian model, describes handling procedures designed to minimize stress, and states that the euthanasia method (rapid chilling, per current AVMA guidance for aquatic species) is consistent with AVMA recommendations.

Counter-example

An application proposing only in vitro work with an established human cell line, or work using invertebrate models such as Drosophila or C. elegans, does not require a VAS — the VAS is triggered specifically by proposed use of live vertebrate animals. Using tissue or cells derived from an animal that was euthanized under a separate, already-approved protocol (and not procured or euthanized specifically for the proposed study) likewise does not, on its own, trigger a VAS requirement, though applicants should confirm this against current NIH/OLAW guidance for the specific scenario, since sourcing details can matter.

Related terms

See also the IACUC, Animal Welfare Act (AWA), PHS Policy, 3Rs (Replacement, Reduction, Refinement), research animal, and attending veterinarian dictionary entries, and the IACUC training guide and Guide for the Care and Use of Laboratory Animals guide for the surrounding institutional oversight framework.