Although now it formally does not stand for anything, the organization AABB was founded in the U.S. in 1947 as the American Association of ______ ______. The group works closely with the FDA and provides technical help in regulations regarding blood donations and storage across the country, while also accrediting transfusion sites. What two-word phrase fills the two blanks?

Considering all the tissues and cells in your body, 25 million new cells are being produced each second.