1.13.12.18 - 1.13.12.18 domains D2-LCF and D3-LCF, sitting drop vapor diffusion method, using 13% (w/v) PEG 10000, 0.075 M bicine pH 7.7, 25% (v/v) glycerol for domain D2-LCF and 18-20% methyl ether PEG 2000, 100 mM EPPS buffer pH 7.8-8.4 for domain D3-LCF 1.13.12.18 Lingulodinium polyedrum luciferase domain 3, vapor diffusion method, using 18-20% (w/v) polyethylene glycol 2000 methyl ether and 100 mM (2-hydroxyethyl)piperazine-N-(3-propanesulfonic acid) (pH 8.0)