Methods of identifying multiple epitopes in cells

A method for identifying whether a plurality of targets are present in a plurality of cells comprising:

• binding to the targets in the plurality of cells a plurality of tags, wherein a tag comprises a unique binding agent (UBA) that is specific for one of the targets, and an epitope specific barcode (ESB) comprising a code that represents the target identity;
• and subsequently adding multiple assayable polymer subunit (APS) oligonucleotides to each of the bound tags in the plurality of cells in an ordered manner during successive rounds of split pool synthesis wherein the APS oligonucleotides in each round anneal adjacently to the APS from a previous round via an annealing region, and covalently linking the adjacently annealed APS oligonucleotides to each other to create unique codes that represent the identities of individual cells in which the tags are bound, and wherein the method does not include a step of isolating each cell in the plurality of cells.