What is in situ?

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"In position, not extending beyond the focus or level of origin." (PDR, Pugh et al. (eds.), 2000)

2000 Physicians Desktop Reference (PDR) Medical Dictionary, N.B. Pugh, B. Werner, T. W. Filardo, P. W. Binns, L. G. Francis, R. Lukens, B. Montgomery, B. L. Ferretti, K. J. Cradle, D. Workman (eds.), Lippincott Williams & Wilkens, Second Edition, pp. 1-2098.