CaV2.1 α1 Subunit Expression Regulates Presynaptic CaV2.1 Abundance and Synaptic Strength at a Central Synapse

？ Ca V2.1 dominate presynaptic active zones are not fully occupied by Ca V2.1 channels ？ Presynaptic Ca V2.1 channel numbers can increase regardless of developmental state ？ Higher synaptic vesicle release probability with increased Ca V2.1 channel numbers ？ Ca V2.1 completely competes away Ca V2.2 channels, but not vice vers