A method for simultaneous measurement of protein and gene expressions in cells, comprising: contacting a plurality of cellular component-binding reagents with a plurality of cells comprising a plurality of cellular component targets and copies of a nucleic acid target, wherein the nucleic acid target comprises mRNA, wherein each of the plurality of cellular component-binding reagents comprises a cellular component-binding reagent specific oligonucleotide comprising a unique identifier for the cellular component-binding reagent and a poly sequence, wherein the cellular component-binding reagent specific oligonucleotide comprises DNA, and wherein the cellular component-binding reagent is capable of specifically binding to at least one of the plurality of cellular component targets; partitioning the plurality of cells associated with the cellular component-binding reagents to a plurality of partitions, wherein a partition of the plurality of partitions comprises a single cell from the plurality of cells associated with the cellular component-binding reagents; in the partition comprising the single cell, contacting a plurality of oligonucleotide barcodes with the cellular component-binding reagent specific oligonucleotides and the copies of the nucleic acid target for hybridization, wherein the oligonucleotide barcodes are attached to a bead and comprise a poly sequence, a first universal sequence, and a first molecular label; extending the cellular component-binding reagent specific oligonucleotides hybridized to the plurality of oligonucleotide barcodes to generate a plurality of extended cellular component-binding reagent specific oligonucleotides each comprising a complement of the first molecular label and a complement of the first universal sequence; extending the plurality of oligonucleotide barcodes hybridized to the copies of a nucleic acid target to generate a plurality of barcoded nucleic acid molecules each comprising a sequence complementary to the at least a portion of the nucleic acid target and the first molecular label; separating the plurality of extended cellular component-binding reagent specific oligonucleotides from the beads obtaining sequence information of the plurality of separated extended cellular component-binding reagent specific oligonucleotides, or products thereof, to determine the number of copies of at least one cellular component target of the plurality of cellular component targets in one or more of the plurality of cells; and obtaining sequence information of the plurality of barcoded nucleic acid molecules, or products thereof, to determine the copy number of the nucleic acid target in one or more of the plurality of cells. contacting a plurality of cellular component-binding reagents with a plurality of cells comprising a plurality of cellular component targets and copies of a nucleic acid target, wherein the nucleic acid target comprises mRNA, wherein each of the plurality of cellular component-binding reagents comprises a cellular component-binding reagent specific oligonucleotide comprising a unique identifier for the cellular component-binding reagent and a poly sequence, wherein the cellular component-binding reagent specific oligonucleotide comprises DNA, and wherein the cellular component-binding reagent is capable of specifically binding to at least one of the plurality of cellular component targets; partitioning the plurality of cells associated with the cellular component-binding reagents to a plurality of partitions, wherein a partition of the plurality of partitions comprises a single cell from the plurality of cells associated with the cellular component-binding reagents; in the partition comprising the single cell, contacting a plurality of oligonucleotide barcodes with the cellular component-binding reagent specific oligonucleotides and the copies of the nucleic acid target for hybridization, wherein the oligonucleotide barcodes are attached to a bead and comprise a poly sequence, a first universal sequence, and a first molecular label; extending the cellular component-binding reagent specific oligonucleotides hybridized to the plurality of oligonucleotide barcodes to generate a plurality of extended cellular component-binding reagent specific oligonucleotides each comprising a complement of the first molecular label and a complement of the first universal sequence; extending the plurality of oligonucleotide barcodes hybridized to the copies of a nucleic acid target to generate a plurality of barcoded nucleic acid molecules each comprising a sequence complementary to the at least a portion of the nucleic acid target and the first molecular label; separating the plurality of extended cellular component-binding reagent specific oligonucleotides from the beads obtaining sequence information of the plurality of separated extended cellular component-binding reagent specific oligonucleotides, or products thereof, to determine the number of copies of at least one cellular component target of the plurality of cellular component targets in one or more of the plurality of cells; and obtaining sequence information of the plurality of barcoded nucleic acid molecules, or products thereof, to determine the copy number of the nucleic acid target in one or more of the plurality of cells.