class="YtLlr aHS+3 V-v0y fm7dv _8teMo _5pKBM" data-component="Text">An enzyme is a type of protein that can speed up chemical reaction in cells. Huc is a "natural battery", the scientists said, and while their research is in its very early stages, their discovery has the potential to be a low-cost power source for small objects. This service may include material from Agence France-Presse (AFP), APTN, Reuters, AAP, CNN and the BBC World Service which is copyright and cannot be reproduced