{'fraction_non_alphanumeric': 0.02026221692491061, 'fraction_numerical': 0.004767580452920143, 'mean_word_length': 5.5625, '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}}
Thymidine Incorporation by Chick Pineal Glands as Studied by Pulse‐Labelling In Vitro

We have studied the pattern of variations in extent of thymidine incorporation during pulse‐labelling in cultured chick pineal glands. During the first 24‐30 h in culture the extent of pulse‐labelling varied in parallel with the cycle in cumulative incorporation. Pulse‐labelling was seen during the period of apparent arrest of cumulative incorporation. However, it was probably “masked” by the SD of assays of cumulative incorporation and represented a minor, but distinct, process of thymidine incorporation. The pattern of variation in extent of pulse‐labelling was qualitatively consistent under a wide variety of conditions. Control of this pattern appeared to be different from that of the circadian rhythm in cumulative thymidine incorporation.