Dscam1, of "drosophila", may be one of the molecules involved in counteracting the netrin-dependent chemoattraction between neuronal processes during the neural development stage. As previously mentioned, the Dscam1 gene in "drosophila" can encode 19008 extracellular domains, which bind homophilically and with isoform specificity. The isoform-specific binding properties of Dscam, during homophilic repulsion, are the basis of self-avoidance, which is a crucial developmental mechanism for uniform distribution of axonal and dendritic processes in the formation of synaptic fields. The neurons express a stochastic array of Dscam1 isoforms on their cell surface. Cells that have the same isoform patterns displaced on their surface, recognize the other as 'self', which leads to self-avoidance with the processes of neurons of the same subtype homophilically repelling from each other.