3.4.21.42	-	659718	
3.4.21.42	complex between the CUB1-EGF-CUB2 domains of C1r and C1s, sitting drop vapor diffusion method, in imidazole buffer at pH 8.0 with PEG 8000 as the precipitant	755267	
3.4.21.42	crystal structure analysis, PDB IDs 1NZI	732889	
3.4.21.42	crystal structure of of a catalytic fragment comprising the second complement control protein (CCP2) module and the chymotrypsin-like serine protease domain determined and refined to 1.7 A resolution	650971	
3.4.21.42	crystallization of the whole C1 complex formed by C1q and 2 copies of each protease C1r and C1s	670975	
3.4.21.42	in the absence of collagen peptide, C1s crystallizes to form a tetramer, similar to the native C1r-C1s-C1r-C1s complex. The tetramer is a flat ring with an outer diameter of about 120 A. The structure is assembled from two X-shaped dimers linked via a connecting interface at the center, structure overview	732820