First, there are really a lot of control mechanisms, formal and informal, which are often ignored by those who say that international organisations are on the loose. (blog.politics.ox.ac.uk)
In the maintenance stage, milk synthesis is controlled at the breast — milk removal is the primary control mechanism for supply. (kellymom.com)
Like in any factory where raw materials are processed, there are various control mechanisms in the cell that check the quality of the products, namely the proteins. (sciencedaily.com)