Source:http://linkedlifedata.com/resource/umls/id/C1519329
NCI: Single Nucleotide Polymorphisms in Coding Sequences consist of a variation at an appreciable frequency between individuals of a single interbreeding population of a single nucleotide, due to base substitution, at an equivalent location within a protein-coding region of a gene that may or may not cause an amino acid change in the protein product and a detectable phenotypic effect.