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Additionally, two groups of cnidarians, corals and sea anemones, exhibit six-or eight-fold symmetry. These types of symmetry are referred to as hexamerism and octamerism, respectively. It should be noted that cnidarians are not the only animals to exhibit radial symmetry.
The Cyclic Groups have one rotational axis of symmetry, for example, C1 symmetry (monomeric protein), C2 symmetry (dimeric protein). The proteins in this group are specialized in functions that require directionality or sidedness such as a formation of a hollow tube or chamber or interaction with membranes.The Dihedral Groups has higher symmetry i.e. it contains an additional perpendicular axis of two-fold symmetry.he proteins in this group are specialized in functions that require directionality or sidedness such as a formation of a hollow tube or chamber or interaction with membranes. The Dihedral Groups has higher symmetry i.e. it contains an additional perpendicular axis of two-fold symmetry.