Quantification of the xylem-to-phloem transfer of amino acids by use of inulin (14 C) Carboxylic acid as xylem transport marker A.J.E. van Bel text Ind Repr. from : Plant Science Letters, 35(1984) : 81-85 Bibl. p. 85. Repr. from : Plant Science Letters, 35(1984) : 81-85 Bibl. p. 85. CYTOLOGY AMINO ACIDS