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We need to translate to English, format: first line headline under 90 chars, no markdown. Then blank line, then body split into short paragraphs (2-3 sentences each), separated by blank lines. Wrap few genuinely important facts — key numbers, percentages, drug/company/gene names, dates — in double asterisks. At most 4-5 per post. Wrap study/journal citations and publication references in single underscores (e.g., Nature Aging, July 2026).
We need to preserve facts, numbers, names, citations exactly. No added commentary.
Let's extract facts:
- Preprint published August 26 (year? Not given; assume 2024? Actually text: "В препринте, опубликованном 26 августа". No year. We'll keep as "26 August". Could be 2024? We'll just keep date as given: 26 August. Wrap date in double asterisks? It's a key date. Yes.
- Study 2016 year, combining four large studies. Wrap 2016 in double asterisks? It's a key number.
- Women whose last menstruation occurred before 50 years — earlier than half participants of this group. So threshold 50 years. Wrap 50 in double asterisks? It's a key number.
- Possibly also mention estradiol (drug/company/gene name). Estradiol is a hormone; could be considered important fact. Wrap estradiol in double asterisks? It's a drug/company/gene name. Yes.
- Possibly mention ovariectomy (removal of ovaries). Not a number.
- Possibly mention epigenetic clocks acceleration measured by several ways. Not a number.
We need at most 4-5 double asterisks. Choose: date (26 August), year 2016, age 50, estradiol. That's four.
Now citations: need to wrap study/journal citations and publication references in single underscores. We have mention of "препринт" (preprint) published August 26. Not a journal. Also mention of "работа 2016 года, объединившей четыре больших исследования". That's a study; we can put it as 2016 study combining four large cohorts? But we need to keep exact citation? The instruction: wrap study/journal citations and publication references in single underscores. So we need to identify citations: maybe "В работе 2016 года" is a citation; we can wrap that as 2016 study. Also maybe "препринте, опубликованном 26 августа" is a publication reference; we can wrap as preprint published 26 August. But we need to keep the original meaning. We'll wrap the phrase describing the citation.
We must not add commentary. Just translate.
Let's craft translation.
Headline: something like "Ovary removal in rats does not speed epigenetic clocks, but early menopause links to faster aging in women". Must be under 90 chars.
Count: "Ovary removal in rats does not speed epigenetic clocks, but early menopause links to faster aging in women". That's about 84 characters (including spaces). Good.
Now body paragraphs.
Paragraph 1: Summarize preprint: In rat experiments, ovary removal did not accelerate biological age calculated from DNA methylation; authors compared two versions of menopause-biological aging link.
We need to keep facts: ovary removal (ovariectomy) didn't change epigenetic clock acceleration; women with earlier menopause had faster clocks.
We'll wrap date in double asterisks: 26 August. Also maybe wrap estradiol later.
Paragraph 2: Explain epigenetic clocks concept, mention 2016 study linking earlier menopause and surgical ovary removal to faster clocks, question direction.
Wrap 2016 in double asterisks: 2016. Also maybe wrap the study citation in underscores: 2016 study combining four large cohorts.
Paragraph 3: Describe rat experiments: ovariectomy, ovariectomy + estradiol, sham surgery; no difference in epigenetic age or acceleration in tissues.
Wrap estradiol in double asterisks: estradiol.
Paragraph 4: Natural reproductive aging in rats: grouped by cycle regularity; no liver differences; all same age.
Paragraph 5: Human data: women whose last menstruation before 50 had higher epigenetic clock acceleration by several calculation methods; threshold 50.…
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