Mutation, point: A single nucleotide base change in the DNA . A point mutation may consist of the loss of a nucleotide, the insertion of an additional nucleotide, or the substitution of one nucleotide for another.

The first point mutation discovered in humans involved the substitution of one nucleotide for another. It was in sickle hemoglobin , the molecular basis for sickle cell trait and sickle cell anemia . The mutation results in an amino acid change from glutamic acid to valine, from normal adult hemoglobin ( hemoglobin A ) to sickle hemoglobin ( hemoglobin S ).

How to Order  |  Price List  |  Refill Orders
Home  |  About Us  |  Contact Us  |  FAQ

Buy cheap canadian prescriptions from a Canadian Internet Pharmacy leader. cheap online pharmacy canadian pharmacy prescription drugs online discount medicine pharmacies online mail order prescription medication canadian online pharmacy search for online drugs canada pharmacies discount canadian medication drugstore Plavix Fosamax Lipitor Celebrex Actonel Flomax Glucophage Premarin Prevacid Evista .