{'fraction_non_alphanumeric': 0.025780189959294438, 'fraction_numerical': 0.005427408412483039, 'mean_word_length': 5.362068965517241, '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}}
Criteria for development of animal models of diseases of the gastrointestinal system.

THE CRITERIA for an acceptable model for gastrointestinal tract disease (Table 1) must involve: 1) an animal disease that closely mimics the human condition, 2) a host whose gastrointestinal tract resembles man in structure and function, and 3) availability, either as large numbers of a naturally occurring disease or as a reproducible experimental model. Inbred lines of rodents have long been exploited as models. Of the domesticated species, only the dog (and to lesser extent, the cat) has been sufficiently studied to understand the entire range of inflammatory, neoplastic, and inherited abnormalities that afflict the alimentary tract of man.