Picloram structure

Figure 1. Chemical structures of (a) picloram, (b) clopyralid, (c) fluroxypyr, and (d) triclopyr.

Three structurally related pyridine herbicides, clopyralid, fluroxypyr, and triclopyr (Figure 1) were tested for cross-reactivity with the polyclonal and monoclonal anti-picloram antibodies. 

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