Egypt's geological history has produced four major physical regions: the Nile Valley and Delta, the Western Desert (also known as the Libyan Desert), the Eastern Desert (also known as the Arabian Desert), and the Sinai Peninsula.
Abbreviation: Ks values. A synonymous mutation is a change in the DNA sequence that codes for amino acids in a protein sequence, but does not change the encoded amino acid. Due to the redundancy of the genetic code (multiple codons code for the same amino acid), these changes usually occur in the third position of a codon.
Neutral mutation. In genetics, a neutral mutation is a mutation that has no effect on fitness. In other words, it is neutral with respect to natural selection. For example, some mutations in a DNA triplet or codon do not change which amino acid is introduced: this is known as a synonymous substitution.