1. A method of determining by single cell analysis the nucleotide sequences of fusion products comprising a plurality of linked nucleic acid molecules encoding at least two chains of a T-cell or B-cell immune receptor of a patient, the method comprising the steps of: (a) separating single T-cells or B-cells from a sample comprising T-cells or B-cells of the patient among a plurality of reactors each containing a polymerase cycling assembly (PCA) reaction mixture comprising a pair of outer primers and one or more pairs of linking primers, at least one pair of such outer and linking primers being specific for a first nucleic acid molecule encoding one chain of an immune receptor and one or more pairs of such outer and linking primers being specific for a second nucleic acid molecule encoding another chain of the immune receptor, wherein both of said nucleic acid molecules have recombined nucleic acid sequences of a B-cell encoding a B-cell receptor or portion thereof or both of said nucleic acid molecules have recombined nucleic acid sequences of a T-cell encoding a T-cell receptor or portion thereof, respectively; (b) performing a PCA reaction in the reactors to form a plurality of different kinds of fusion products comprising a plurality of different nucleic acid molecules encoding the immune receptor chains of the single T-cell or B-cell; (c) spatially isolating individual molecules of said fusion products; and (d) sequencing the spatially isolated fusion product molecules to obtain nucleotide sequences of fusion products comprising a plurality of linked nucleic acid molecules encoding at least two chains of a T-cell or B-cell immune receptor of a patient.