... study, performed the majority of the laboratory work and analysis, and drafted the manuscript. AJF participated in the design of the study andinterpretation of data. JAH conceived the study, ... marker of rep-licative history and of the cumulative history of stress inducers of senescence, as well as an indicator of the probability of cellsenescence [25]. In this study, we have investigated ... age, sex, and spine level in 600 autopsyspecimens. Spine 1988, 13:173-178.3. Roughley PJ, Alini M, Antoniou J: The role of proteoglycans in aging, degeneration and repair of the intervertebral...