#bone_marrow__marrow  the fatty network of connective tissue that fills the cavities of bones
  supertype:  #connective_tissue  tissue of mesodermal origin consisting of e.g. collagen fibroblasts and fatty cells; supports organs and fills spaces between them and forms tendons and ligaments
  part of:  #bone  #immune_system
  subtype:  #red_marrow__redmarrow__red_bone_marrow  bone marrow of children and some adult bones that is required for the formation of red blood cells
  subtype:  #yellow_marrow__yellow_bone_marrow  bone marrow that is yellow with fat; found at the ends of long bones in adults

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