coordinate the behavior of all the cells within that tissue. Direct connections between cells also function in this coordination. Bone matrix Bone is a form of connective tissue found in the body, composed largely of hardened hydroxyapatite-containing collagen. In larger mammals, it is arranged in osteon regions. Bone matrix allows mineral salts such as calcium to be stored and provides protection for internal organs and support for locomotion. Cartilage matrix Cartilage is another form of connective tissue found in the body, providing a smooth surface for joints and a mechanism for growth of bones during development. Subcellular matrices Mitochondrial matrix In the mitochondrion, the matrix contains soluble enzymes that catalyze the oxidation of pyruvate and other small organic molecules. Nuclear matrix In the cell nucleus the matrix is the insoluble fraction that remains after extracting the solubled DNA. Golgi matrix The Golgi matrix is a protein scaffold around the Golgi apparatus made up of Golgins, GRASP's and miscellaneous other proteins on the cytoplasmic side of the Golgi apparatus involved in keeping its shape and membrane stacking. Matrix (medium) A matrix is also a medium in which bacteria are grown (cultured). For instance, a Petri dish of agar may be the matrix for culturing a sample swabbed from a patient's throat. See also Matricity Tissues and cells Germinal matrix Hair matrix cell Molecular biology Matrix attachment region Matrix metalloproteinase Matrix protein Bioinformatics and sequence evolution PAM matrix Position-specific scoring matrix Similarity matrix Substitution matrix Botany and agriculture Matrix Planting Population biology and ecology Matrix population models References Cell anatomy Connective tissue Organelles Matrices (biology)