Transient expression of amiRNA reduces expression of the endogenous target genes. A, Schematic of the GI, ELF3, and ZTL transcripts with the amiRNA targeted site (vertical bars) and the PCR-amplified region (horizontal black bars) indicated for each. B, Relative expression of GI, ELF3, and ZTL from protoplasts transfected with control amiRNA or the gene-specific amiRNA indicated and harvested at ZT12. Expression levels were determined by real-time qPCR and normalized to ACTIN2 (ACT2). Data represent mean ± SEM (n = 3).