PCR technique (Polymerase Chain Reaction), Animation. It is a technique used to make multiple copies of a segment DNA of interest, generating a large amount of copies from a small initial simple. Amplification of DNA segments makes possible the detection of pathogenic virus or bacteria, identification of individuals (DNA fingerprinting), and several scientific research involving DNA manipulation. Spanish version: http://youtu.be/TalHTjA5gKU This video has been produced in the Institute of General Organic Chemistry of the CSIC (IQOG-CSIC) by Guillermo Corrales, as part of its task for promoting Science Communication and may be freely used for educational and science popularization purposes