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A wave of DNA demethylation occurs during the initiation of meiosis in spermatogenesis, which is essential for male meiotic recombination 19

But people continue to light up, sometimes for reasons that go beyond the physical

Homozygotes for the null allele in SIGLEC14 are associated with a reduced risk of exacerbation in a population of Japanese patients 160 , while allele G of rs2075803 and haplotype GA (rs2075803 G/rs2258983 A) in SIGLEC9 were associated with a higher frequency of exacerbations and with the emphysema level 161

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The best and safest thing you can do is to quit completely for good." Deborah Arnott, chief executive of health charity ASH, said: "It's addiction to nicotine that keeps people smoking but it's the tar in cigarette smoke that does the serious damage