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Inactivation of β-galactosidase activity by fluorescein-labeled antibodies against β-galactosidase after being exposed to 2 mW (64 mW/cm2) of light at 488 nm. Controls with the same level of fluorescein fluorescence were also performed: in one case fluorescein was bound to anti-HA antibodies; in the other case, it was attached to BSA. Each point is the average of at least three independent activity determinations using an orthonitrophenyl galactoside colorimetric assay.
