A container system and a method of its use is disclosed. The grafts are especially useful in treating scar tissue on the heart. The SIRs may be defined during the deposition process with uniform deposition within each SIR or the SIRs may be defined subsequent to the deposition of layers wherein the layers are deposited with a gradient in one or more properties across the substrate. Adjustment under stirring of the reaction mixture to model intestinal digestion conditions for a time corresponding to intestinal digestion,the rheometer being provided with a stirrer used to homogenize the mixture and measure the viscosity andor the viscoelasticity thereof. The cooling fan includes an annular portion extending in the axial direction to overlap with a bearing holder formed in the housing. A category from the first set of categories of content of broadcasted programs is added to a second set of categories of content of broadcasted programs upon the category from the first set of categories of content of broadcasted programs being selected.