Editing Leghemoglobin (section)

== Other plant hemoglobins ==
{{main|Phytoglobin}}
Globins have since been identified as a protein common to many plant taxa, not restricted to symbiotic ones. In light of this discovery, it has been proposed that the term phytoglobins be used for referring to plant globins in general.<ref name="phytoglobin">{{cite journal |last1=Becana |first1=Manuel |last2=Yruela |first2=Inmaculada |last3=Sarath |first3=Gautam |last4=Catalán |first4=Pilar |last5=Hargrove |first5=Mark S. |title=Plant hemoglobins: a journey from unicellular green algae to vascular plants |journal=New Phytologist |date=September 2020 |volume=227 |issue=6 |pages=1618–1635 |doi=10.1111/nph.16444|pmid=31960995 |doi-access=free |bibcode=2020NewPh.227.1618B |hdl=10261/219101 |hdl-access=free }}</ref>

Phytoglobins can be divided into two clades. The 3/3-fold type contains Classes I and II of angiosperm phytoglobins, and is the one common to all eukaryotes ([[horizontal gene transfer|HGT]] of a bacterial flavohemoglobin). The leghemoglobin ''sensu stricto'' is a class II phytoglobin. The 2/2-fold "TrHb2" type contains class III in angiosperm nomenclature, and appears to be acquired from [[Chloroflexota]] (formerly Chloroflexi) by the ancestor of land plants.<ref name="phytoglobin"/>