Editing Symbiogenesis (section)

== Nitroplasts ==

A unicellular marine alga, ''[[Braarudosphaera bigelowii]]'' (a [[coccolithophore]], which is a eukaryote), has been found with a cyanobacterium as an endosymbiont. The cyanobacterium forms a nitrogen-fixing structure, dubbed the [[nitroplast]]. It divides evenly when the host cell undergoes mitosis, and many of its proteins derive from the host alga, implying that the endosymbiont has proceeded far along the path towards becoming an organelle. The cyanobacterium is named [[Candidatus Atelocyanobacterium thalassa|''Candidatus'' Atelocyanobacterium thalassa]], and is abbreviated UCYN-A. The alga is the first eukaryote known to have the ability to fix nitrogen.<ref name="Massana 2024">{{cite journal |last=Massana |first=Ramon |date=12 April 2024 |title=The nitroplast: A nitrogen-fixing organelle |url=https://www.science.org/doi/10.1126/science.ado8571 |journal=Science |volume=384 |issue=6692 |pages=160–161 |doi=10.1126/science.ado8571 |pmid=38603513 |bibcode=2024Sci...384..160M |issn=0036-8075 |access-date=15 April 2024 |archive-date=15 April 2024 |archive-url=https://web.archive.org/web/20240415055905/https://www.science.org/doi/10.1126/science.ado8571 |url-status=live |url-access=subscription |hdl=10261/354070 |hdl-access=free }}</ref><ref name="Coale Loconte Turk-Kubo Vanslembrouck 2024">{{cite journal |last1=Coale |first1=Tyler H. |last2=Loconte |first2=Valentina |last3=Turk-Kubo |first3=Kendra A. |last4=Vanslembrouck |first4=Bieke |last5=Mak |first5=Wing Kwan Esther |last6=Cheung |first6=Shunyan |last7=Ekman |first7=Axel |last8=Chen |first8=Jian-Hua |last9=Hagino |first9=Kyoko |last10=Takano |first10=Yoshihito |last11=Nishimura |first11=Tomohiro |last12=Adachi |first12=Masao |last13=Le Gros |first13=Mark |last14=Larabell |first14=Carolyn |last15=Zehr |first15=Jonathan P. |title=Nitrogen-fixing organelle in a marine alga |journal=Science |volume=384 |issue=6692 |date=2024-04-12 |issn=0036-8075 |doi=10.1126/science.adk1075 |pages=217–222|pmid=38603509 |bibcode=2024Sci...384..217C }}</ref>