Table 3. Protein homologs to the core clock proteins of mammals.

Organism	Protein		Clock function	C. elegans homolog	E value
Mus musculus	PER	PER1	central clock	F47F6.1c (LIN-42c)	7.50E-17
		PER2	central clock	F47F6.1b (LIN-42b)	2.90E-21
		PER3	central clock	F47F6.1b (LIN-42b)	5.50E-20
	BMAL	BMAL1	central clock	C25A1.11a (AHA-1a)	1.80E-65
		BMAL2	central clock	C25A1.11a (AHA-1a)	5.40E-63
	CLK		central clock	C25A1.11a (AHA-1a)	1.50E-17
	NPAS2		central clock	C25A1.11a (AHA-1a)	6.80E-19
	CRY	CRY1	central clock	None	none
		CRY2	central clock	None	none

These proteins are the best hits found by probabilistic inference search based on Hidden Markov Models built upon multiple protein alignments of the core clock of mammals (M. musculus). Common C. elegans names are enclosed between parenthesis when available.