general protocol: https://www.encodeproject.org/documents/f7779792-9403-4396-9ff6-8e859edd608c/@@download/attachment/In-situ%20chiapet_Ruan%20Lab_final.pdf other: https://www.encodeproject.org/documents/0d5e4227-7a85-445a-825c-45bf2bbdba6c/@@download/attachment/ChIA-PET_User_notice.pdf