Table 1. Contents of the GPCRDB and NucleaRDB information systems.

Data types	GPCRDB (July 2000)	NucleaRDB (August 2000)
Receptor sequences	1796	630
including fragments	444	117
Families, subfamilies, …	222	109
Unclassified sequences	0	106
cDNA–protein alignments	2434	725
Multiple sequence alignments	213	96
3D models (nine depositors)	1290	*
Ligand binding data	∼12 000	*

*Not yet available at the time of the preparation of this manuscript.