Abstract: A system for identification of a biological structure present in a liquid biopsy sample is provided. The system identifies common biological structures and rare biological structures based on their fluorescence characteristics and morphology. The identified biological structures may be used in diagnosis and treatment of a human afflicted with a disease. Examples described in this disclosure also relate to methods and assays that may be used together with the systems of this disclosure for diagnosis and treatment of a human afflicted with a disease.

Abstract: Molds for making cell aggregation devices include upper and lower surfaces. Methods of aggregating cells include depositing cells on in a seeding chamber, incubating the cells and removing aggregated cells. Devices for encapsulating aggregates of cells include biocompatible, bio-sustainable substrates compartments and a coating of a biocompatible, bio-sustainable polymer that completely surrounds the substrate and cell-encapsulating compartments.

Abstract: The invention is a cell aggregation device comprising a hydrogel substrate having at least one, preferably a plurality, of cell-repellant compartments recessed into the uppermost surface. Each compartment is composed of an upper cell suspension seeding chamber having an open uppermost portion and a bottom portion, and one, or more than one, lower cell aggregation recess connected to the bottom portion of the upper cell suspension seeding chamber by a port. The diameter of the port may be fully contiguous with the walls of the chambers and walls of the recesses, or the diameter of the port may be more narrow than the walls of the chamber but fully contiguous with the walls of the recesses or more narrow than both the walls of the chamber and the walls of the recesses. The upper cell suspension seeding chambers are formed and positioned to funnel the cells into the lower cell aggregation recesses through gravitational force.