An addendum to the Introduction of Cole et al. [(2017), Acta Cryst. D73, 234-239] is made to recognize the work of Bricogne, Smart and others in the development of methods to make use of Cambridge Structural Database data in protein structure solution.

Screening of the Helicobacter pylori genomic library with sera from infected humans and from immunized rabbits resulted in identification of the 25 kDa protein cell envelope (HppA) which exhibits acid phosphatase activity. Enzyme activity was demonstrated by specific enzymatic assays with whole-cell protein preparations of H. pylori strain N6 and from Escherichia coli carrying the hppA gene (pU...

This paper constructs a political equilibrium in which firms and unions bargain over wages and workers and capitalists lobby the government for taxation, labor market regulation and immigration policy. The main findings are the following. It is in the native workers’ interests to ban firms’ direct recruitment from abroad. Otherwise, the ruling elite captures the surplus of the labor unions by t...