Regular expressions provide a very powerful way to describe patterns in text, making them an excellent resource for string validation and manipulation. The .NET Framework provides first-rate support for regular expressions in its System.Text.RegularExpressions namespace and specifically the Regex class found there.
Other mutations reduce but don't completely eliminate the activity of beta-hexosaminidase A and these genetic changes are responsible for the less severe forms of Tay-Sachs disease, which appear later in life as late onset TSD.ere are two locations for the HEXA gene. Cytogenetic Location: 15q23-q24 (The HEXA gene is located on the long (q) arm of chromosome 15 between positions 23 and 24. Each chromosome is divided into two sections called 'arms'.
Paw et al. (1990) analyzed the frequency of 3 HEXA mutations among heterozygotes identified in a Tay-Sachs screening program: the 4-nucleotide insertion in exon 11 (606869.0001), the G-to-C transversion at the 5-prime splice site in intron 12 (606869.0002), and the gly269-to-ser mutation in exon 7 (606869.0008).