Fig. (1) (A) Representative growth curve of an ATLL case in the presence (●) or absence (■) of 20 nM damnacanthal without HUVEC. A cell line was not established in this case. (B) Representative growth curve of HU-ATTAK on HUVEC cells in the presence (■) or absence (▲) of 20 nM damnacanthal. A similar growth curve was observed in an independent experiment. Cell numbers are plotted using a log scale.