In a first aspect a marker (100, 404, 500) for analysing a biological sample with a plurality of target analytes (107, 113, 406, 506) is provided. The marker (100, 404, 500) comprises a first marker part (102) comprising a first
affinity reagent (106, 400, 502) and a first
label, the first
label comprising a first polymeric backbone (108) attached to the first
affinity reagent (106, 400, 502) and a plurality of first
labelling moiety parts (110) attached to the first polymeric backbone (108), and a second marker part (104) comprising a second
affinity reagent (112, 402, 504) and a second
label, the second label comprising a second polymeric backbone (114) attached to the second affinity
reagent (112, 402, 504) and a plurality of second
labelling moiety parts (116) attached to the second polymeric backbone (114). The first
labelling moiety parts (110) and the second labelling moiety parts (116) are configured to bind to the respective other one (110, 116) to form labelling moieties (118). The first affinity
reagent and the second affinity
reagent are each configured to bind specifically to one of the target analytes of the biological sample. In a further aspect, a method for analysing a biological sample is provided.