Resolution improvement from `in situ annealing' of copper nitrite reductase crystals

Significant improvement of the resolution of copper nitrite reductase crystals was achieved by using the in situ annealing technique. The effective resolution limits increased by 1.5 Å from 2.5 to 1.0 Å, the mosaicity value decreased from 1.5 to 0.3° and the spot shape changed from elliptical to circular.