Contents | Science 384, 6692
COVER A nitrogen-fixing organelle, or “nitroplast,” has been identified in a marine alga on the basis of intracellular imaging and proteomic evidence. This discovery sheds light on the evolutionary transition from endosymbiont to organelle. The image depicts the cell architecture and synchronized cell division of the alga Braarudosphaera bigelowii with nitroplast UCYN-A (large brown spheres). See pages 160 and 217. Large Millimeter Telescope Alfonso Serrano at risk of running out of funding in August,