Section, Pub. L. 91–616, title V, § 501, as added Pub. L. 94–371, § 7, July 26, 1976, 90 Stat. 1038; amended Pub. L. 95–622, title II, § 268(c), (d), Nov. 9, 1978, 92 Stat. 3437; Pub. L. 96–180, § 14, Jan. 2, 1980, 93 Stat. 1305, which directed Secretary to take certain steps to encourage research, was redesignated section 510 of the Public Health Service Act by Pub. L. 98–24, § 2(b)(9), Apr. 26, 1983, 97 Stat. 179, and is classified to section 290bb of this title.

A prior section 501 of Pub. L. 91–616, title V, Dec. 31, 1970, 84 Stat. 1854, was renumbered 601 by section 7 of Pub. L. 94–371, and is classified to section 4591 of this title.