For one species of comb jelly, survival from injury can come down to numbers. Two Mnemiopsis leidyi– aka the sea walnut–can fuse together and turn into one after an injury. These bioluminescent ctenophores will then rapidly get their muscle contractions in sync and even merge their digestive tracts to share food sources. The findings are detailed in a study published October 7 in the Cell Press journal Current Biology.“Our findings suggest that ctenophores may lack a system for allorecognitio...