Fig. 1. False positives due to wheat lectin with ricin LFDs and SEB LFDs. A) 0.5 μg/mL ricin in 50% PBSTM, B) 250 μg/mL lectin in the buffer supplied with the LFDs,
C) 250 μg/mL lectin in PBS, and D) 250 μg/mL lectin in 50% PBSTM. The presence of a second (T) red line at the position indicated by the arrows indicated a (false)
positive response. The presence of 50% PBSTM eliminated the occurrence of the second (T) red line due to the presence of wheat lectin. The ricinwas obtained from
Vector Laboratories (Burlingame, CA). LFDs were obtained from Tetracore, Inc. and a U.S. Government source. (For interpretation of the references to color in this
figure legend, the reader is referred to the web version of this article.)