TABLE 1.

Frequencies of invasion of cultured HeLa and CEF cells by M. gallisepticum strain R populations

M. gallisepticum strain R populationa	% Invasionb
	HeLa-229	CEF
Rlow	4.17 ± 0.72	5.48 ± 1.12
Rlowp3	4.98 ± 1.29	8.96 ± 1.10
Rlowp10	6.02 ± 0.68	9.33 ± 0.88
Rhigh	0.35 ± 0.24	1.11 ± 0.34
Rhighp10	4.72 ± 1.16	5.69 ± 1.52

^aDescribed in Materials and Methods. 

^bPercentage of mycoplasmas forming colonies after gentamicin treatment relative to the initial inoculum. Values represent the means of at least three independent experiments performed in triplicate ± standard deviations.