| http://www.w3.org/ns/prov#value | - Control of the environment a)Physiochemical parameters i.e. pH, temperature, osmotic pressure, oxygen, carbon dioxide b)Physiological conditions supplementation of medium with defined constituents i.e serum, hormones and other regulatory substances Nutrient concentrations need to be regulated c)Microenvironment Regulation of matrix (cell attachment and growth improved by pretreating the subtrate :
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