A, Functional characterization of the gene candidates PdCYP79D16, PdCYP71AN24, PdUGT85A19, PdUGT94AF1, PdUGT94AF2, and PdUGT94AF3 by transient expression in N. benthamiana and monitoring of product formation by LC-MS analysis and selected ion monitoring. When PdCYP79D16 and PdCYP71AN24 are coexpressed, small amounts of prunasin and prunasin-malonate ester can be detected, as compared with the control (p19). Amygdalin is detected only when at least three genes are coexpressed. B, Representative LC-MS recordings of the experiments shown on the gray background in A. Data are presented as means of three independent agroinfiltrated leaves ± sd.