Sensitivity of probes to Prorocentrum donghaiense determined by the FISH assaysa.

aCells with signal intensity similar to the positive control were scored as “+++”; signal intensity equivalent to the negative control was scored as “−”; signal intensities clearly above the negative but below the positive control were scored as “++” or “+”, depending on the brightness relative to the positive and negative probes; signal intensity above the positive control was scored as “++++”.