{'fraction_non_alphanumeric': 0.01715686274509804, 'fraction_numerical': 0.013480392156862746, 'mean_word_length': 5.333333333333333, '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}}
The insulin signal initiating cellular differentiation is preserved by chick embryo myoblasts incubated at 2 degrees C.

Insulin pulse treatment, lasting for 1 to 3 min, stimulates differentiation of chick embryo myoblasts to myotubes and myofibers in a serum-free medium. The use of serum-free medium supplemented with 2,2'-thiodiethanol permits terminal differentiation of chick embryo myoblasts to cross-striated, spontaneously contracting myofibers. The experiments carried out showed that incubation of chick embryo myoblasts after the insulin pulse treatment for 10 days at 2 degrees C does not inhibit the progress of their differentiation. The data demonstrate that differentiation can be interrupted at any time by transferring cells to 2 degrees C and resumed without delay after returning to 37 degrees C.