Salmon sperm DNA Salmon Sperm DNA does not activate any TLR and can be used as a negative control for TLR induction experiments. Non-induction of TLR-expressing cells has been confirmed in concentrations up to 1 mg/ml. Working concentration: 5 - 100 μg/ml Endotoxin level: EndoFit™ (<0.001 EU/μg) Solubility: 1 mg/ml in water Variety: Sheared DNA