A method for analysing individual cells comprising: (a) providing a plurality of partitions, where a given partition of the plurality of partitions comprises components of a cell, a plurality of barcode molecules coupled to a bead, and a plurality of analytes comprising: (i) a first analyte which is a nucleic acid molecule; (ii) a second analyte which is a labelling agent capable of coupling to a cell surface feature of the cell, wherein the labelling agent comprises a B-cell receptor engager and comprises a reporter oligonucleotide; wherein the plurality of barcode molecules comprises: (i) a first individual barcode molecule, which comprises a first nucleic acid barcode sequence, and is capable of coupling to the first analyte; and (ii) a second individual barcode molecule, which comprises a second nucleic acid barcode sequence, and is capable of coupling to the second analyte; and (b) in bulk or in the given partition, (i) coupling the first individual barcode molecule to the first analyte and synthesizing a first nucleic acid molecule comprising at least a portion of the first nucleic acid barcode sequence or complement thereof and a sequence of the first analyte or complement thereof; and (ii) coupling the second individual barcode molecule to the second analyte and synthesizing a second nucleic acid molecule comprising at least a portion of the second nucleic acid barcode sequence or complement thereof and a sequence of the reporter oligonucleotide or complement thereof; and (c) subjecting the first nucleic acid molecule and the second nucleic acid molecule, or a derivative of the first nucleic acid molecule and/or the second nucleic acid molecule, to sequencing to characterize the first analyte and the second analyte. (a) providing a plurality of partitions, where a given partition of the plurality of partitions comprises components of a cell, a plurality of barcode molecules coupled to a bead, and a plurality of analytes comprising: (i) a first analyte which is a nucleic acid molecule; (ii) a second analyte which is a labelling agent capable of coupling to a cell surface feature of the cell, wherein the labelling agent comprises a B-cell receptor engager and comprises a reporter oligonucleotide; wherein the plurality of barcode molecules comprises: (i) a first individual barcode molecule, which comprises a first nucleic acid barcode sequence, and is capable of coupling to the first analyte; and (ii) a second individual barcode molecule, which comprises a second nucleic acid barcode sequence, and is capable of coupling to the second analyte; and (i) a first analyte which is a nucleic acid molecule; (ii) a second analyte which is a labelling agent capable of coupling to a cell surface feature of the cell, wherein the labelling agent comprises a B-cell receptor engager and comprises a reporter oligonucleotide; (i) a first individual barcode molecule, which comprises a first nucleic acid barcode sequence, and is capable of coupling to the first analyte; and (ii) a second individual barcode molecule, which comprises a second nucleic acid barcode sequence, and is capable of coupling to the second analyte; and (b) in bulk or in the given partition, (i) coupling the first individual barcode molecule to the first analyte and synthesizing a first nucleic acid molecule comprising at least a portion of the first nucleic acid barcode sequence or complement thereof and a sequence of the first analyte or complement thereof; and (ii) coupling the second individual barcode molecule to the second analyte and synthesizing a second nucleic acid molecule comprising at least a portion of the second nucleic acid barcode sequence or complement thereof and a sequence of the reporter oligonucleotide or complement thereof; and (i) coupling the first individual barcode molecule to the first analyte and synthesizing a first nucleic acid molecule comprising at least a portion of the first nucleic acid barcode sequence or complement thereof and a sequence of the first analyte or complement thereof; and (ii) coupling the second individual barcode molecule to the second analyte and synthesizing a second nucleic acid molecule comprising at least a portion of the second nucleic acid barcode sequence or complement thereof and a sequence of the reporter oligonucleotide or complement thereof; and (c) subjecting the first nucleic acid molecule and the second nucleic acid molecule, or a derivative of the first nucleic acid molecule and/or the second nucleic acid molecule, to sequencing to characterize the first analyte and the second analyte.