Most plants of the Asgrow Mutable line of soybean are chimeric for flow-er color (Groose and Palmer, 1986). Mutable plants produce both entirely near-white and entirely purple flowers, as well as flowers of mutable phenotype with purple sectors on near-white petals. This line carries an unstable recessive ('mutable') allele of the w4 locus that conditions anthocyanin pigmentation (Weigelt et al., 1986)..pdf