dc31f04.y1 NICHD_XGC_Emb3 Xenopus laevis cDNA clone IMAGE:3398719 5' similar to gb:X63522 RETINOIC ACID RECEPTOR RXR-BETA ISOFORM 2 (HUMAN); gb:X66224 M.musculus mRNA for retinoid X receptor-beta (MOUSE), mRNA sequence