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Henry-York Steiner, Wei Song, Larry Zhang, Fred Naider, Jeffrey M. Becker, Gary Stacey, An Arabidopsis Peptide Transporter Is a Member of a New Class of Membrane Transport Proteins, The Plant Cell, Vol. 6, No. 9 (Sep., 1994), pp. 1289-1299
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Steiner et al. (1994) studied this question.
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