Experimental article published on 29 April 1994 in Science 264(5159), pp. 719–725. The 2013 PMC availability date is distinct from journal publication.
Cited passages: Figure 2A–C; Table 2 and discussion of activity counts and loss of rhythmicity; References and Notes 10 and 14; Vitaterna and others (1994), Mutagenesis and Mapping of aMouseGene, Clock, Essential for Circadian Behavior, Figure 1 and References and Notes 6–10.