Relative gene expression. The relative expression of targeted genes in the STE, LTE and N regimens for selected coral (A) and dinoflagellate (B) genes by qPCR. Relative quantities were normalized to two most stable reference genes with pairwise variations (V) for minimum of 2 or 3 reference genes (V2/3) below 0.15. The mean expression level was obtained as ratio of treatment vs. control (C24 correspond to control at 24 h and C72 - control at 72 h) for five biological replicates. The statistical difference between means is indicated as *P < 0.05 or **P < 0.01.