Which of the following agencies is involved in food regulation aside from the FDA?

The National Marine Fisheries Service is involved in food regulation, particularly when it comes to seafood. This agency plays a crucial role in managing and regulating the nation's marine resources, ensuring that seafood is harvested sustainably and that fishing practices do not jeopardize marine ecosystems. It collaborates with other agencies to monitor the safety and quality of seafood products, additionally helping to set guidelines and enforce laws related to fishery management.

The other options listed do not primarily focus on food regulation. The Department of Labor deals with employment and workplace standards, the Federal Trade Commission focuses on consumer protection and antitrust laws, and the National Institute of Standards and Technology develops measurement standards, which do not specifically pertain to food regulation. Thus, the National Marine Fisheries Service stands out as a key agency contributing to food safety and quality regulations in the seafood sector.