Table 2.

Summary of features of RH cysts, RH tachyzoites, and conventional tissue cysts (e.g., strain ME49)

Type of cyst or tachyzoiteCharacteristic
Cyst wallBAG-1 AgaSAG-1 AgNuclear localizationRhoptry shape and contentPepsin-HCl resistance of bradyzoites
RH cystsPresentPositiveNegativePosteriorElongate, honeycombedSensitive
ME49 cystsPresentPositiveNegativePosteriorBulbous, electron denseResistant
RH tachyzoitesAbsentNegativePositiveCentralElongate, honeycombedSensitive
  • a Ag, antigen.