M. Ragland RAGLAND, M., & THEIL, E. C. (1993, February). FERRITIN (MESSENGER-RNA, PROTEIN) AND IRON CONCENTRATIONS DURING SOYBEAN NODULE DEVELOPMENT. PLANT MOLECULAR BIOLOGY, Vol. 21, pp. 555–560. https://doi.org/10.1007/BF00028813 Ragland, M., Briat, J. F., Gagnon, J., Laulhere, J. P., Massenet, O., & Theil, E. C. (1990). Evidence for conservation of ferritin sequences among plants and animals and for a transit peptide in soybean. Journal of Biological Chemistry, 265(30), 18339.