{'fraction_non_alphanumeric': 0.02819548872180451, 'fraction_numerical': 0.015037593984962405, 'mean_word_length': 5.1976744186046515, '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}}
An improved short-term culture method for human mammary epithelial cells.

An improved short-term culture method for human mammary epithelial cells was developed and the details are presented. Briefly, after the digestion of biopsy tissues with 0.2% collagenase solution for 16 to 18 hr, 4 consecutive fractions were obtained by differential sedimentation. The last fraction, S-4, contained organoids having alveolar- or duct-like structures and gave rise to mammary epithelial cell growth with minimal contamination of fibroblasts.