| CPC G01N 33/6842 (2013.01) [C40B 40/10 (2013.01); C40B 70/00 (2013.01); G01N 33/6845 (2013.01)] | 20 Claims |

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1. A kit for analyzing a polypeptide, comprising:
(a) a functionalizing reagent that reacts with an N-terminal amino acid (NTAA) of the polypeptide to generate a functionalized NTAA of the polypeptide;
(b) one or more nucleic acid recording tags configured to associate directly or indirectly with the polypeptide or with a component of the polypeptide obtained by a cleavage of the functionalized NTAA of the polypeptide, wherein each of the one or more nucleic acid recording tags comprises a unique molecular identifier (UMI); and
(c) one or more binding agents each comprising:
(i) a binding moiety that binds to the functionalized NTAA of the polypeptide or the component of the polypeptide obtained by the cleavage of the functionalized NTAA of the polypeptide; and
(ii) a nucleic acid coding tag attached to the binding moiety and comprising a barcode sequence that comprises identifying information regarding the binding moiety;
wherein the one or more nucleic acid recording tags and the one or more nucleic acid coding tags are configured to allow transfer of sequence information of the barcode sequence and/or the UMI by ligation or primer extension, upon binding between each binding agent and the functionalized NTAA of the polypeptide or the component of the polypeptide, thereby generating one or more extended nucleic acid constructs each comprising the barcode sequence or a complement thereof and the UMI or a complement thereof.
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