Report on a project on three-dimensional imaging of the biological cell by single-particle X-ray diffraction. Addendum.

In the paper by Sayre [Acta Cryst. (2008), A64, 33-35], a proposal is made to use stereoscopy as a short-term means of overcoming the primarily technological hurdles involved in three-dimensional imaging of the biological cell by soft X-ray diffraction microscopy. This addendum provides a broader perspective on the techniques used by this rapidly maturing community to investigate structural problems in the biological and material sciences.