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Lectins are carbohydrate binding proteins that can stimulate cell proliferation. This property makes these biomolecules capable of being used as mitogen reagents to study the interaction with lymphocytes allowing evaluation of immunomodulatory action, since B and T lymphocytes are related to humoral and innate immunity, respectively. Isolated cells from spleen, which include lymphocytes, are widely applied as a model in screening lectin mitogenic capacity. This mitotic stimulus is initiated by interaction of the lectin with T-cell receptor on cell surface. This brief review article aims to explain how cell proliferation, especially lymphocytes, can be achieved through lectin induction. Additionally, this work intends to highlight the main colorimetric and radiographic techniques to encourage the scientific community in searching for new mitogenic lectins.