Chlorotoxin is a 36-amino acid peptide found in the venom of the deathstalker scorpion (Leiurus quinquestriatus) which blocks small-conductance chloride channels.
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CTX: Cy5.5 bioconjugate which is a combination of chlorotoxin and a fluorescent material named, Cy5.5 has been recently used by Researchers at Seattle Children’s Hospital Research Institute and Fred Hutchinson Cancer Research Center to demarcate cancer cells from the surrounding normal cells.