Schema (IMAGE) CNRS Caption Encoded polymers have been incorporated into polyvinyl alcohol implants, which were implanted into rats. After an in vivo incubation period, the implants were removed. Mass spectrometry can identify the polymer that marks each implant. Credit KARAMESSINI et al./ICS Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.