Rationale: The supplemental table S1 contains 1264 proteins identified in the PSD preparation (Synaptic junctional protein preparation). As tenascins are generally described in the literature as extracellular matrix components we consider the protein as part of the perisynaptic or synaptic extracellular matrix.. Experimental description: "Briefly adult mouse brains (2–16 months, 20 animals, 10 g wet weight) were homogenized ..." p. 915