{'fraction_non_alphanumeric': 0.02813852813852814, 'fraction_numerical': 0.0183982683982684, 'mean_word_length': 5.25, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Expression of Mycoplasma gallisepticum F-strain surface epitope.

The expression of a Mycoplasma gallisepticum (MG) F-strain surface epitope was studied using monoclonal antibody 6F10. Different F strain colonies were cloned based on positive or negative expression of the 6F10-recognized epitope. Clones selected for the lack of expression of this epitope (negative clones) reverted rapidly to positive expression. On the other hand, negative clones derived from F-strain-vaccinated chickens expressed the 6F10-recognized epitope variably. After in vitro passages, two groups of cultures were observed. One group reverted rapidly to positive expression. The other group exhibited a very slow rate of reversion, with 30% or fewer of their colonies expressing the 6F10-recognized epitope. These results indicate that the 6F10-recognized surface epitope of F-strain is variably expressed under in vivo and in vitro conditions.