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Figure 7 : Development of periodicity of P.S. in the kittenEach circle represents 1 h; the black sectors show the average duration of phases of P.S., and the white sectors the intervals between. Key: (A) First week; (B) Second week; (C) First month; (D) Second month; (E) Third month; (F) Adult. From Valatx et al., 1964. |