40. Al-Hallaq RA, Jarabek BR, Fu Z, Vicini S, Wolfe BB, et al. (2002) Association of NR3A with the N-methyl-D-aspartate receptor NR1 and NR2 subunits. Mol Pharmacol 62: 1119–1127. 41. McGee AW, Topinka JR, Hashimoto K, Petralia RS, Kakizawa S, et al. (2001) PSD-93 knock-out mice reveal that neuronal MAGUKs are not required for development or function of parallel fiber synapses in cerebellum. J Neurosci 21: 3085–3091. 42. Rancillac A, Cre´pel F (2004) Synapses between parallel fibres and stellate cells express long-term changes in synaptic efficacy in rat cerebellum. J Physiol 554: 707–20. Presynaptic NMDARs in Cerebellar Interneurons 43. Fayyazuddin A, Villaroel A, Le Goff A, Lerma J, Neyton J (2000) Four residues of the extracellular N-terminal domain of the NR2A subunit control high-affinity Zn2+ binding to NMDA receptors. Neuron 25: 683–694. 44. Rengifo J, Gibson CJ, Winkler E, Collin T, Ehrlich BE (2007) Regulation of the inositol 1,4,5-trisphosphate receptor type I by O-GlcNAc glycosylation. J Neurosci 27: 13813–21. 45. Collin T, Chat M, Lucas MG, Moreno H, Racay P, et al. (2005) Developmental changes in parvalbumin regulate presynaptic Ca2+ signaling. J Neurosci 25: 96– 107. 46. Tan YP, Llano I (1999) Modulation by K+ channels of action potential-evoked intracellular Ca2+ concentration rises in rat cerebellar basket cell axons. J Physiol 520: 65–78. PLoS ONE | www.plosone.org 14 June 2012 | Volume 7 | Issue 6 | e39983