Discusses research which investigated the formation of patterns in the development of neurons in mice with the reeler phenotype. How the mechanisms for pattern formation are unknown; Mutation of reelin gene in mice; Reelin's nature and functions; Research by Sheldon et al and Howell et al in October 16, 1997 edition of `Nature' and Ware et al in `Neuron'; Isolation of scrambler mutation; Targets of reeler mutation; Updated model of Reelin action; Questions raised.