Beta thalassemias occur due to malfunctions in the hemoglobin subunit beta or HBB. "Beta testers" are people who actively report issues of beta software. These correspond to alpha, beta and gamma radiation. It does this by binding to alpha and beta receptors. Epinephrine does this by its effects on alpha and beta receptors. Gamma rays were first thought to be particles with mass, like alpha and beta rays. Integrins are heterodimers which are formed from one beta and one alpha subunit. The technical alpha continued until the beginning of the closed beta. Usage of the "alpha/beta" test terminology originated at IBM. It included a demo mod made by several beta testers. She was a member of Gamma Phi Beta sorority. Other potential triggers include medications such as aspirin and beta blockers. The iOS 9 public beta was also compatible with it. Along with Trillian 5.0 For Windows and the aforementioned Mac beta. The purification of human beta interferon did not occur until 1977.