Hershey heaven and Caenorhabditis elegans.

Identifies Caenorhabditis elegans (C. elegans) as the first animal genome to be sequenced. Determination of the complete pattern of cell divisions which creates the somatic cells in the adult animal; Dependency of classical genetics on the isolation of mutants with clearly defined phenotypes; Possibility of transiently and genetically mutating genes in C. elegans.