Currently I am working with the Anti-MAP Kinase, Activated (Diphosphorylated ERK-1&2) antibody, Mouse monoclonal from Sigma-Aldrich as primary and the fluorescence-tagged Goat anti Mouse IgG (H/L):DyLight®649 (Bio-Rad) as secondary antibody to detect phosphorylated mitogen-activated protein kinase 3 (MPK3) due to treatments of Arabidopsis plants with plant extracts (western blot assays, ChemiDoc MP system). My point is that the primary antibody is not sufficiently specific (no plant-specific reactivity). Now we have new fluorescence-tagged Goat Anti-Rabbit IgG secondary antibodies for testing but have not yet been able to find an appropriate primary antibody. We would like to purify the blots and incubate them again. Does anyone work on this, who could recommend a product or who could send me an aliquot of an antibody that may match (anti-rabbit)?