What is one requirement laid out by USDA regulations for IACUC members?

The correct choice emphasizes the mandated composition of an Institutional Animal Care and Use Committee (IACUC) as stipulated by USDA regulations. The inclusion of a veterinarian is crucial, as they bring the necessary expertise in animal health and well-being. The requirement for a chair ensures effective leadership and organization of the committee's meetings and functions. Additionally, having a nonaffiliated member—someone who does not have a vested interest in the institution—provides an essential outside perspective to the committee's deliberations, helping to safeguard the welfare of the animals by ensuring unbiased evaluation of the research proposals.

These three roles together help to create a well-rounded committee that can effectively oversee animal care and use while upholding ethical standards, ensuring compliance with regulations, and addressing any potential conflicts of interest. This structure supports the mission of the IACUC to balance scientific research with the humane treatment of animals.