שאלה | Some individuals were profiled for DNA methylation twice, at different ages. There was a correlation between chronological age and age predicted from methylation. However, why do you think that different individuals had different slope of lines connecting the early with the later points (Fig. 1 C,D)?

Some individuals were profiled for DNA methylation twice, at different ages. There was a correlation between chronological age and age predicted from methylation. However, why do you think that different individuals had different slope of lines connecting the early with the later points (Fig. 1 C,D)?

		Because different individuals were at different ages when sampled.
		Because young individuals age faster than old individuals.
		Because old individuals age faster than young individuals.
		Because all individuals age at the same chronological rate but at different biological rates.

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