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Figure 1. Schematic of portions of two neurons. A terminal axon (left) forms a synapse with a dendritic spine of a second neuron (right). Interiors of both neurons show cytoskeletal structures including microtubules, actin and microtubule-associated proteins (MAPs). Dendritic microtubules are arrayed in mixed polarity local networks, interconnected by MAPs. Synaptic inputs are conveyed to dendritic microtubules by ion flux, actin filaments, second messengers (e.g. CaMKII, see Hameroff et al, 2010) and MAPs.