The acronym TUNEL stays for "TdT-mediated dUTP-biotin nick end labeling" (Gavrieli et al., J. Cell Biol., 119: 493, 1992). Actually, it is a misnomer, because DNA breaks in apoptotic cells (which "TUNEL" is labeling) are double strand breaks and not nicks. Nicks are single strand DNA breaks. Zbigniew Darzynkiewicz
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