... include: establishing cell shape, providing mechanical strength, locomotion, chromosome separation in mitosis/meiosis and intracellular transport of organelles. These diverse activities of the cytoskeleton depend on different types of protein fibres which are, actin filaments (or otherwise known as microfilaments), microtubules and intermediate filaments. It was interesting to discover in the research of my essay that in the book 'Molecular Biology of the Cell' (alberts et al) it was stated as the cytoskeleton consisting of only three types of fibre listed above but I have found on the internet that there was a fourth type of protein fibre involved. These fibres are known as microtrabeculae. I think the obvious reason for this is that 'Molecular Biology of the Cell' was published in 1993 and information on the internet is updated regularly therefore this fourth type of protein fibre must have been discovered recently. This backs up my statement that there is ...

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