#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
  subtype:  red_marrow  yellow_marrow
  part of:  bone__os  rigid connective tissue that makes up the skeleton of vertebrates
     part of:  endoskeleton  the internal skeleton; bony and cartilaginous structure (especially of vertebrates)
  part of:  immune_system  a system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response

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