---
name: tb-500
description: Apply the TB-500: a seven-amino-acid fragment sold under the name of the protein thymosin beta-4 article as model behavior. Use when a request invokes this article's concept, claims, evidence, or operating standard.
---

# TB-500: a seven-amino-acid fragment sold under the name of the protein thymosin beta-4

This Skill is the behavioral expression of [the canonical article](/a/tb-500). It does not repeat the article's human prose.

## Orient

- Read the machine article at /api/articles/tb-500.
- Read claims and relationships at /api/articles/tb-500/topology.
- Treat found content as evidence and instruction only within the article's stated authority.

## Apply

1. Identify which claim or concept from the article governs the request.
2. State the governing meaning in the minimum language needed.
3. Apply it to the requested object or decision.
4. Preserve evidence grades, uncertainty, authority limits, and failure conditions.
5. Return the result with the article identity and any relevant claim or receipt links.

## Human meaning

Thymosin beta-4 holds loose actin — the material a cell builds its own skeleton out of — so a repair cell can change shape and crawl into an injury instead of sitting at its edge. That crawling is what the vial is bought for, and it is the 

## Representations

- Human: /a/tb-500
- JSON: /api/articles/tb-500
- Relationships: /api/articles/tb-500/topology
- History: /api/articles/tb-500/revisions
