Gene switching in Amoeba proteus caused by endosymbiotic bacteria -- Jeon and Jeon 117 (4): 535 -- Journal of Cell Science

Gene switching in Amoeba proteus caused by endosymbiotic bacteria -- Jeon and Jeon 117 (4): 535 -- Journal of Cell Science: "The xD strain of Amoeba proteus arose from the D strain by spontaneous infection of X-bacteria (Jeon and Lorch, 1967), and xD amoebae are now dependent on their symbionts for survival. Each xD amoeba contains about 42,000 symbionts within symbiosomes, and established xD amoebae die if their symbionts are removed. Newly infected xD amoebae become dependent on X-bacteria within 18 months (about 200 cell generations) (Jeon and Ahn, 1978)...." Jeon TJ, Jeon KW. Gene switching in Amoeba proteus caused by endosymbiotic bacteria. J Cell Sci. 2004 Feb 1;117(Pt 4):535-43. Epub 2004 Jan 6.

Also: Free Full Text articles bold
J Eukaryot Microbiol. 2004 Sep-Oct;51(5):502-8.
J Eukaryot Microbiol. 2003 Jan-Feb;50(1):61-9.
J Eukaryot Microbiol. 1998 Nov-Dec;45(6):600-5.
J Eukaryot Microbiol. 1997 Nov-Dec;44(6):614-9.
J Eukaryot Microbiol. 1997 Sep-Oct;44(5):412-9.
Gene. 1996 May 24;171(1):89-93.
Trends Cell Biol. 1995 Mar;5(3):137-40.
Gene. 1994 Oct 11;148(1):43-9.
Infect Immun. 1994 Jan;62(1):65-71.
J Bacteriol. 1980 Mar;141(3):1466-9.
J Cell Physiol. 1979 Jan;98(1):49-57.
J Protozool. 1977 May;24(2):289-93.
J Cell Physiol. 1976 Oct;89(2):337-44.
J Protozool. 1975 Aug;22(3):402-5.
Science. 1972 Jun 9;176(39):1122-3.