Assertion: gill's filament | /r/CapableOf | produce blue phycocyanin
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Source sentences:
text: Prokaryotic filaments or gelatinous colonies of photosynthetic cells; produce the blue phycocyanin and red phycoerythrin phycobilin pigments; not always blue-green as in the coloration of the Red Sea by Trichodesmium erythraeum; referred to as "blue-green algae" in some references; cyanobacteria live in some of the most bizarre places on earth, including the trunks of trees and the roots of cycads; they also form a thin, black layer on the limestone blocks of Maya pyramids in Central America; cyanobacteria include some of the oldest life forms on earth and produce stromatolite fossils in limestone over 2 billion years old.