| 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} |
| 418 | DF | .~.~ Precipitation {1} |
| 419 | | .~.~.~ With added material {2} |
| 420 | DF | .~.~.~.~> Inorganic |
| 421 | DF | .~.~.~.~> Polymeric, e.g., polyethylene glycol, etc. |