Table 1.

Average lifetimes of select extracellular matrix (ECM) and synaptic proteins (as reported in Fornasiero et al., 2018).

Protein	Half-life in adult mouse brain (days, range for several regions shown)
Brevican	17–31
Neurocan	20–97
Aggrecan	24
Versican	49–687
Tenascin-R	39–74
Synaptic proteins:
SNAP25	3–4
VAMP2	11–15
Synaptotagmin1	9–10
NMDA receptors	3–7
AMPA receptors	6–15
PSD95	13–16
Homer1	13–14