| 530 / | HD | CHEMISTRY: NATURAL RESINS OR DERIVATIVES; PEPTIDES OR PROTEINS; LIGNINS OR REACTION PRODUCTS THEREOF |
| 350 | DF | PROTEINS, I.E., MORE THAN 100 AMINO ACID RESIDUES {14} |
| 412 | DF | .~ Separation or purification {6} |
| 415 | ![]() | .~.~ Selective absorbtion, e.g., Ca phosphate sorbents, etc. {2} |
| 416 | DF | .~.~.~> Ion exchange |
| 417 | DF | .~.~.~> Chromatography or by septum selective as to material, e.g., gel filtration, molecular sieve dialysis, etc. |