; (2) not later than 3 months after the close of the comment period for such proposed regulations, promulgate such regulations as final; and (3) not later than 6 months after the date such regulations are promulgated as final, begin implementation of such regulations. (c) Definitions In this section, the terms establishment that performs donor screening and establishment that performs donor testing have the meanings given to such terms under part 1271 of title 21, Code of Federal Regulations. 4. Guidance on current good tissue practice and additional requirements for manufacturers of human cells, tissues, and cellular and tissue-based products Not later than 6 months after the date of enactment of this Act, the Secretary of Health and Human Services, acting through the Commissioner of Food and Drugs, and in coordination with the Director of the Centers for Disease Control and Prevention, shall— (1) review the guidance titled Guidance for Industry—Current Good Tissue Practice (CGTP) and Additional Requirements for Manufacturers of Human Cells, Tissues, and Cellular and Tissue-Based Products (HCT/Ps) (December 2011); and (2) issue an updated version of such guidance. 5. Compliance with CUTGO No additional funds are authorized to be appropriated to carry out this Act, and this Act shall be carried out using amounts otherwise available for such purpose.