Article: The writer Sherrel W. Stewart's assertion that "most" African Americans have significant Native American heritage, is not supported by genetic researchers who have done extensive population mapping studies. The TV series on African-American ancestry, hosted by the scholar Henry Louis Gates, Jr., had genetics scholars who discussed in detail the variety of ancestries among African Americans. They noted there is popular belief in a high rate of Native American admixture that is not supported by the data that has been collected. (Reference is coming)

Question: Who disproved Sherrel's hypothesis?
genetic researchers who have done extensive population mapping studies