Assertion: gel | /r/HasProperty | photographed using epi-fluorescence illumination
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Source sentences:
text: Caption: FIG 2 Photomicrographs of gels that originated from stagnant regions of the screw, such as from Moffat eddies: a) a bright-field photograph, and b) the same gel photographed using epi-fluorescence illumination, indicating that the gel is highly oxidized.