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(1) They are obligate autotrophs, and represent unusual lipid profile with linear C 18 : 0 and C 20: 1 as major lipids.

(2) They possess a unique quinone, 2 methylthio -1, 4 naphthoquinone.

(3) They have a unique carotenoid pigment.

(4) They possess outer protein coats.

(5) They have a relatively small genome size (Ca 1.0 x 10° bp) compared with the genomes of other bacteria (Ca. 4.0 x 106 bp).

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