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allophycocyanin
This term is a highly specialized biochemical designation used almost exclusively in microbiology, botany, and biochemistry. It describes a specific pigment protein, meaning it carries a neutral, technical connotation and is never used in casual or non-scientific conversation.
As a chemical compound and a specific protein, the word is treated as an uncountable mass noun. It refers to the substance itself rather than individual units of the protein, and therefore does not typically take a plural form in scientific literature.
Meanings
A blue-colored phycobiliprotein found in cyanobacteria and red algae that functions as an accessory pigment for photosynthesis by capturing light energy and transferring it to chlorophyll a.
The researchers analyzed the concentration of allophycocyanin in the photosynthetic apparatus of the cyanobacteria.