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Diaphorase activity assayed with nitrotetrazolium blue chloride (NBT, blue precipitates) in R. farinacea thalli (A–D). Bright-field microscopy of slices cut in a freezing microtome (magnification 1000×). The areas framed with discontinuous lines have been digitally magnified in the corresponding insets (A1, C1 and D1). C with chondroid tissue, PL phycobiont layer, Pho microalgae, M medulla, Hy fungal hyphae.
