<P> In addition to the roles described above, Stuart Hameroff and Roger Penrose have proposed that microtubules function in consciousness . </P> <Table> <Tr> <Th> Cytoskeleton type </Th> <Th> Diameter (nm) </Th> <Th> Structure </Th> <Th> Subunit examples </Th> </Tr> <Tr> <Th> Microfilaments </Th> <Td> 6 </Td> <Td> double helix </Td> <Td> actin </Td> </Tr> <Tr> <Th> Intermediate filaments </Th> <Td> 10 </Td> <Td> two anti-parallel helices / dimers, forming tetramers </Td> <Td> <Ul> <Li> vimentin (mesenchyme) </Li> <Li> glial fibrillary acidic protein (glial cells) </Li> <Li> neurofilament proteins (neuronal processes) </Li> <Li> keratins (epithelial cells) </Li> <Li> nuclear lamins </Li> </Ul> </Td> </Tr> <Tr> <Th> Microtubules </Th> <Td> 23 </Td> <Td> protofilaments, in turn consisting of tubulin subunits in complex with stathmin </Td> <Td> α - and β - tubulin </Td> </Tr> </Table> <Tr> <Th> Cytoskeleton type </Th> <Th> Diameter (nm) </Th> <Th> Structure </Th> <Th> Subunit examples </Th> </Tr> <Tr> <Th> Microfilaments </Th> <Td> 6 </Td> <Td> double helix </Td> <Td> actin </Td> </Tr>

Which of the following cellular processes or characteristics is not related to the cytoskeleton