A change from MX growth medium to a solution of 8% SUC induces the expression of a large number of proteins in cell cultures of Catharanthus roseus (Vetter et al., 1992; our unpublished results). In a differential screen for induced mRNAs, we identified a cDNA for a basic 14-kD polypeptide with four putative membrane-associated helices (Fig. 1, Table I). It also contains a Pro-Lys-Pro motif tha...
