Micromasonry is the term researchers at the MIT-Harvard Division of Health Sciences and Technology have coined for encapsulating living cells in polyethylene glycol(PEG)-making a kind of “biological Legos”-which can then be placed into three dimensional structures using a silicon-based polymer template.  A light source “cements” the PEG, which eventually dissolves and leaves a tissue structure.  Their immediate aim is to build capillaries in this way that would deliver a blood supply to larger constructions.      MORE