Risperdal and Seizures. FDA ALERT [04/2005] Risperdal is a type of medicine called an atypical antipsychotic. FDA has found that older patients treated with atypical antipsychotics for dementia had a higher chance for death than patients who did not take the medicine. This is not an approved use.
Introduction. Chromosomal DNA replication occurs during a phase of the cell cycle known as the S phase. Although the length of the S phase can vary significantly between different cell types, several absolute controls exist that dictate when and how many times in a cell cycle DNA replication can occur.
In eukaryotes, the cell cycle consists of four discrete phases: G 1, S, G 2, and M. The S or synthesis phase is when DNA replication occurs, and the M or mitosis phase is when the cell actually divides.The other two phases â G 1 and G 2, the so-called gap phases â are less dramatic but equally important.ells typically spend far more time in interphase than they do in mitosis. Of the four phases, G 1 is most variable in terms of duration, although it is often the longest portion of the cell cycle (Figure 1). Figure 1: The eukaryotic cell cycle. Â© 2013 Nature Education All rights reserved.