Heterogeneity of Genome Sizes within the Genus Spiroplasma

^* Corresponding author. Mailing address: Laboratoire de Biologie Cellulaire et Moléculaire, INRA et Université de Bordeaux II, BP81, 33883 Villenave d'Ornon Cedex, France. Phone: 33.56.84.31.50. Fax: 33.56.84.31.59. Electronic mail address: laigret{at}bordeaux.inra.fr .