Seven out of eighty-four candidate genes selected for downstream analyses.

Genes are sorted by decreasing level of transcript abundance in the two Symbiodinium EST libraries combined. Details of the EST libraries displaying hits in BLASTn are indicated for each gene by letters A, C, Ac, At, Ht, Kb, Km, and Lp, which correspond to EST libraries Symbiodinium A, Symbiodinium C, Amphidinium carterae, Alexandrium tamarense, Heterocapsa triquetra, Karenia brevis, Karlodinium micrum, and Lingulodinium polyedrum, respectively. Protein descriptions were obtained using BLASTx. The complete list of candidate genes (n = 84) identified after BLASTn comparisons of eight dinoflagellate EST libraries is presented in Table S1.