C. elegans protein families:
the 20 commonest protein domains in the proteome

from the C. elegans genome consortium paper in the December 11th 1998 Science

number	description
650	seven-transmembrane spanning chemoreceptor
410	eukaryotic protein kinase domain
240	two domain, C4 type zinc finger
170	collagen
140	seven-transmembrane spanning rhodopsin-family receptor
130	C2H2 type zinc finger
120	C-type lectin
100	RNA recognition motif
90	C3HC4 type (RING finger) zinc fingers
90	protein tyrosine phosphatase
90	ankyrin repeat
90	WD domain G-beta repeat
80	homeobox domain
80	neurotransmitter gated ion channel
80	cytochrome P450
80	conserved C-terminal helicase
80	short chain and alcohol dehydrogenases
70	UDP-glucoronosyl and UDP-glucosyl transferases
70	EGF-like domain
70	immunoglobulin superfamily