Abstract: Methods of analysis of a sample using hybridization chain reaction (HCR) are provided herein. Some embodiments involve one, two, or all three of the following aspects: 1) repeated signal detection, 2) overlapping binding sites, and 3) catalytic reporter deposition (CARD). Compositions and kits relating to these are also provided. Some embodiments encompass a method for repeated signal detection with reporter-labeled HCR hairpins involving providing a sample possibly containing one or more targets as well as possibly other molecules that are not targets, providing one or more probe sets each comprising either: a) one or more HCR initiator-labeled probes, or b) one or more probe units each comprising two or more HCR fractional initiator probes, providing one or more HCR amplifiers (each labeled with one or more reporters), detecting one or more signals from one or more reporters.

Abstract: Methods of analysis of a sample using hybridization chain reaction (HCR) are provided herein. Some embodiments involve one, two, or all three of the following aspects: 1) repeated signal detection, 2) overlapping binding sites, and 3) catalytic reporter deposition (CARD). Compositions and kits relating to these are also provided. Some embodiments encompass a method for repeated signal detection with reporter-labeled HCR hairpins involving providing a sample possibly containing one or more targets as well as possibly other molecules that are not targets, providing one or more probe sets each comprising either: a)one or more HCR initiator-labeled probes, or b) one or more probe units each comprising two or more HCR fractional initiator probes, providing one or more HCR amplifiers (each labeled with one or more reporters), detecting one or more signals from one or more reporters.

Abstract: The present disclosure relates to methods involving HCR reactions that involve using trigger oligos to activate probes that initiate HCR.

Abstract: The present disclosure relates to methods and compositions involving HCR reactions that involve initiators that are split into two or more parts. Effective HCR is dependent upon two or more of these split initiators being brought into proximity (e.g., via binding events mediated by a target) such that a full initiator is formed that is capable of triggering HCR signal amplification.

Abstract: The present disclosure relates to methods and compositions involving HCR reactions that involve initiators that are split into two or more parts. Effective HCR is dependent upon two or more of these split initiators being brought into proximity (e.g., via binding events mediated by a target) such that a full initiator is formed that is capable of triggering HCR signal amplification.

Abstract: The present disclosure relates to methods involving HCR reactions that involve using trigger oligos to activate probes that initiate HCR.

Abstract: The present disclosure relates to methods and compositions involving HCR reactions that involve initiators that are split into two or more parts. Effective HCR is dependent upon two or more of these split initiators being brought into proximity (e.g., via binding events mediated by a target) such that a full initiator is formed that is capable of triggering HCR signal amplification.