title: Physical heterogeneity of hatching enzyme of the sea urchin, Strongylocentrotus purpuratus.
mesh_terms: D000818:Animals; D002499:Centrifugation, Density Gradient; D011232:Chemical Precipitation; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D004447:Echinodermata / Q000196:embryology / Q000201:enzymology*; D004589:Electrophoresis, Disc; D004625:Embryo, Nonmammalian / Q000201:enzymology*; D007527:Isoenzymes; D046911:Macromolecular Substances; D008970:Molecular Weight; D010447:Peptide Hydrolases / Q000302:isolation & purification*; D000644:Quaternary Ammonium Compounds; D013431:Sulfates
chemical_list: D007527:Isoenzymes; D046911:Macromolecular Substances; D000644:Quaternary Ammonium Compounds; D013431:Sulfates; D010447:Peptide Hydrolases