Lecture 07, concept 03: Collagen is a special proline helix (bone, teeth, parts of skin)
05:50•3,448x
If you find several Ads windows appear, just Close the Ads and return to this page, then click the "Download" button again, the Download process will start immediately!
Sorry for showing a lot of ads, we need to make money to pay for the server and keep the tubidy service running smoothly. We apologize for the inconvenience, Your patience is greatly appreciated!
