Structure of a (3+1) hybrid G-quadruplex in the PARP1 promoter

Singapore National Research Foundation Investigatorship [NRF-NRFI2017-09]; Nanyang Technological University (NTU Singapore) (to A.T.P.); The Balasubramanian laboratory is core-funded by Cancer Research UK [C14303/A17197]; Cancer Research UK programme [C9681/A18618]; S.B. is a Welcome Trust Senior Investigator [099232/Z/12/Z]; The authors acknowledge the use of NMR facilities at the NTU Institute of Structural Biology. Funding for open access charge: Singapore National Research Foundation.