haemerythrin


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hem·e·ryth·rin

(hēm'ĕ-rith'rin)
Any of several iron-containing, oxygen-binding circulatory proteins in certain invertebrates, with molecular weights similar to that of hemoglobin but lacking porphyrin groups.
Synonym(s): haemerythrin.
[hem- + G. erythros, red, + in]

haemerythrin

an iron-containing proteinaceous red pigment found in the blood plasma of some ANNELIDS and several minor invertebrate groups. Like HAEMOGLOBIN, the pigment can become oxygenated, but in this case oxygen uptake involves a change in valency from Fe(II) to Fe(III).