“Caged” Photoactivatable Probes

• Ca++: Nitr-5

• Ca++ - buffering: Diazo-2

• IP3

• cAMP

• cGMP

• ATP

• ATP-?-S

Available Probes

Principle: Nitrophenyl blocking groups e.g. nitrophenyl ethyl ester undergoes photolysis upon exposure to UV light at 340-350 nm

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