This Section needs to be updated. The reason given is: It is unclear whether Slashdot still uses Slash or some newer look-alike since around 2009. Please help update this article to reflect recent events or newly available information. (January 2019) The sickle (betas) mutation in the beta-globin gene (HBB) occurs https://share.google/FOCkrywjbHrUX0WrE