TH and autism: Other proteins that regulate social space in Drosophila are e.g. the synaptic protein Neurobeachin, an anchor protein that is homologous to the autism candidate gene NBEA [56] and the pre-synaptic proteins involved in dopaminergic synthesis and release [103, 104], homologues of the vesicular monoamine transporter (VMAT) and Tyrosine hydroxylase (TH) involved in dopamine synthesis.