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Cover (Upper right) The GABAergic neurons DVB and AVL are defective in sem-4 C. elegans. A sem-4; unc-30 animal stained with anti-GABA antibodies shows premature termination of the ALV axon. (For details, see Basson and Horvitz, p.1953.) (Lower left) Aberrant innervation of atypical melanotrophs in mice. Shown is apoptosis of atypical cells after S-phase entrance and BrdU labeling. BrdU-positive nuclei of apoptotic cells have condensed chromatin. (For details, see Nikitin and Lee, p. 1870.)