The discovery of lysosomes.
D000135:Acid Phosphatase / Q000378:metabolism; D000818:Animals; D003585:Cell Biology / Q000266:history*; D002451:Cell Compartmentation; D002458:Cell Fractionation; D004705:Endocytosis; D004721:Endoplasmic Reticulum / Q000378:metabolism; D049673:History, 20th Century; D006867:Hydrolases / Q000032:analysis / Q000378:metabolism*; D008247:Lysosomes / Q000378:metabolism* / Q000648:ultrastructure; D008830:Microbodies / Q000378:metabolism; D008954:Models, Biological; D010587:Phagocytosis
D006867:Hydrolases; D000135:Acid Phosphatase