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.
The problem of how DNA replication occurs only once in each cell cycle has been partially resolved by studies in the fission yeast, Schizosaccharomyces pombe, where genetic approaches have been used to study the sequential coupling of the S and M phases. As will be discussed, Cdk are implicated as central regulators.