1. Amann, R. , Springer, N. , Ludwig, W. , Görtz, H. D. & Schleifer, K. H. 1991. Identification in situ and phylogeny of uncultured bacterial endosymbionts. Nature, 351:161â164.
2. Blin, N. & Stafford, D. N. 1976. A general method for isolation of high molecular weight DNA from eukaryotes. Nucleic Acids Res., 3:2303â2308.
3. Chen, Y. L. , Law, P. Y. & Loh, H. H. 2006. Sustained activation of phosphatidylinositol 3-kinase/Akt/nuclear factor κB signaling mediates G protein-coupled δ-opioid receptor gene expression. J. Biol. Chem., 281:3067â3074.
4. Chomczynski, P. & Sacchi, N. 1987. Single-step method of RNA isolation by acid guanidium thiocyanateâphenolâchloroform extraction. Anal. Biochem., 162:156â159.
5. Dryl, S. 1959. Antigenic transformation in Paramecium aurelia after homologous antiserum treatment during autogamy and conjugation. J. Protozool., 6:25.