Tryptophan,molecular model. Essential amino acid and one of the 20 standard amino acids. Atoms are represented as spheres and are colour-coded: carbon (grey),hydrogen (blue-green),nitrogen (blue) and oxygen (red) | |
Licence : | Libre de droits |
Crédit: | Science Photo Library / Pasieka, Alfred |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |