Transcriptional repressor which may act as a negative- feedback regulator of CLOCK-BMAL1 transcriptional activity in the circadian-clock mechanism. May stimulate BMAL1-dependent phosphorylation of CLOCK. However, the physiological relevance of these observations is unsure, since experiments in an animal model showed that CIPC is not critially required for basic circadian clock. . This is the function of ENSG00000198894 (CIPC, CLOCK interacting pacemaker).