A regular expression is a pattern that the regular expression engine attempts to match in input text. A pattern consists of one or more character literals, operators, or constructs. For a brief introduction, see .NET Framework Regular Expressions.
(For our list of subjects with an imprinting defect, click here.). UBE3A Mutation. Malfunction of the UBE3A gene on the maternal chromosome #15 seems to be the cause of Angelman syndrome. In the case of a UBE3A mutation, there is a mistake in the genetic code of the UBE3A gene.
For example, some individuals with Angelman syndrome may have seizures, others may not. Most may be unable to speak while in a few there is some limited speech. Children with Angelman syndrome experience delays in reaching developmental milestones (developmental delays) and have severe learning disabilities.