Table 1.

EC₅₀ values from curves generated from the receptor binding assay (RBA) and XTT cytotoxicity assay (mean ± SD).

Brevetoxin	RBA EC50	XTT EC50
PbTx-2	9.5 ± 0.74 nM	2.63 ± 0.9511 µM
PbTx-3	27.6 ± 7.56 nM	47.01 ± 1.068 µM
PbTx-6	584.5 ± 129 nM	2.09 ± 1.183 µM
BTX-B5	427.9 ± 123 nM	57.87 ± 0.4809 µM