{'fraction_non_alphanumeric': 0.016710642040457344, 'fraction_numerical': 0.014951627088830254, 'mean_word_length': 4.524271844660194, '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}}
Recovery of 15N in liver, muscle tissue, and in the lens of the eye after administration of 15N-ammonium acetate to rats and rabbits.

15N-ammonium acetate was injected into rats and rabbits. The 15N excess was determined in protein and NPN from muscle tissue and plasma and/or from liver and lens. In liver and plasma protein the incorporation values were already high one day after administration and decreased rapidly during the time of investigation, 9 to 13 days. In protein and NPN from muscle tissue the 15N excess increased up to the 4th day, whereafter it decreased slowly. In lens protein the excess also rose during 4 days but did not reach values exceeding about one-third of those from muscle protein and one-tenth of the values from plasma and liver protein. The 15N in lens NPN remained considerably higher than in protein in spite of a rapid decrease. The results indicate that muscle protein has a much lower turnover rate than plasma and liver protein, and that intracellular amino acids are utilized for muscle protein synthesis. They also confirm that a considerable part of the lens protein has a very slow turnover.