Useful references for immunolocalization work: DeWitte et al. (1999). Dynamics of cytokinins in apical shoot meristems of a day neutral tobacco during floral transition and flower formation. Plant Physiol. 119:111-121. Shiozaki et al. (1999). Localisation of abscisic acid in grape berry by immunohitochemical techniques. J.Japan Hort.Sci.68:1-9.  Skene et al. (1987). Model systems for the immunolocalisation of cis, trans-abscisic acid in plant tissues. Planta 172:192-199. Sosountozov et al. (1986). Immunoelectron-microscopy localisation of abscisic acid with collodial gold on Lowicryl-embeded tissues of Chenopodium polyspermum L. Planta 168: 471-481. Zavala et al. (1983). Localisation of a phytohormone using immunocytochemistry. J.Cell Biol. 97:1235-1239.