The unit cell (a) is defined by the number of atoms in the motif (b)is structure that is related to biology but not inorganic crystals (c) is defined by the basic repeating lengths of a crystal's lattice parameters (a. b,c) and the angles between each of the unit lengths of a crystal's lattice (α, β, γ). (a, b.c) lattice (a, b, y) (d)is defined by the basic repeating lengths of a crystal's lattice parameters (e) is defined by the angles between each of the unit lengths of a crystal's ps