Peroxisomes are generally encased in a lipid bilayer, occasionally including a crystalloid core, depending on the organism in which the peroxisome exists. Peroxisomes were the last organelle to be characterised in the eukaryotic cell (Hu et al. 2012). Their main function involves interaction with oxygen species in the cell; however, there are many processes that it can perform. They have a simple structure, consisting of a single lipid-bilayer membrane (unlike the mitochondria) filled with a variety of enzymes. Typically, the most concentrated of these enzymes, catalase or urate oxidase, can become so high in number that they aggregate to form a crystalline core in the centre of the organelle. This structure can be seen in electron micrographs.
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