Half a century of immunological discovery: EJI celebrates its golden anniversary!Dear readers, As we mentioned in our previous editorial [1], the European Journal of Immunology (EJI) celebrates its 50th anniversary this year! When the first EJI issue was published in January 1971, immunology was recognized as an important discipline, but was still in its infancy. Key molecular and cellular concepts such as somatic recombination, antigen receptors, DC and NK cell, and diverse regulatory T-cell subsets were all yet to be discovered. Over the next half a cen-