As of the 2007 reorganization, Al Wahat District was subdivided into seventeen Basic People's Congresses, namely, Zueitina, East Ajdabiya, West Ajdabiya, North Ajdabiya, Brega, Bashir, Sultan, al`Arqub, El Agheila, Albydan, Antalat, Marsa Brega, Alguenan, Awjila, Jalu, Jikharra and Maradah. The following major towns are located within Al Wahat District, as of 2007: Ajdabiya, Awjila, Labba, El Agheila, Jalu, Jikharra and Sultan. Palindromic sequence  A palindromic sequence is a nucleic acid sequence in a double-stranded DNA or RNA molecule wherein reading in a certain direction (e.g. 5' to 3') on one strand matches the sequence reading in the same direction (e.g. 5' to 3') on the complementary strand. This definition of palindrome thus depends on complementary strands being palindromic of each other. The meaning of palindrome in the context of genetics is slightly different from the definition used for words and sentences. Since a double helix is formed by two paired antiparallel strands of nucleotides that run in opposite directions, and the nucleotides always pair in the same way (adenine (A) with thymine (T) in DNA or uracil (U) in RNA; cytosine (C) with guanine (G)), a (single-stranded) nucleotide sequence is said to be a palindrome if it is equal to its reverse complement. For example, the DNA sequence ACCTAGGT is palindromic because its nucleotide-by-nucleotide complement is TGGATCCA, and reversing the order of the nucleotides in the complement gives the original sequence. A palindromic nucleotide sequence is capable of forming a hairpin. Palindromic motifs are found in most genomes or sets of genetic instructions. They have been specially researched in bacterial chromosomes and in the so-called Bacterial Interspersed Mosaic Elements (BIMEs) scattered over them. In 2008, a genome sequencing project discovered that large portions of the human X and Y chromosomes are arranged as palindromes. A palindromic structure allows the Y chromosome to repair itself by bending over at the middle if one side is damaged.