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.
Synonymous Mutations (Silent Mutations). With 61 codons for 20 amino acids, many of the codons are synonyms, coding for the same amino acid. Each amino acid can be indicated by up to six different codons (in the case of leucine); only two (methionine and tryptophan) have only one codon.