Santos, D. N. dos; Nunes, C. F.; Soares, J. D. R.; Alves, E.; Labory, C. R. C.; Pasqual, M.; Pio, L. A. S. <B&gt;Ultrastructural and Cytochemical Analysis of Physic Nut Callus Tissue in Response to Different Combinations of Growth Regulators. Acta Sci. Agron. 2015, 37, 355-359.