An optically-activated caged compound is : reversibly cleaved by light absorption irreversibly cleaved by light absorption irreversibly isomerised by light absorption reversibly isomerised by light absorption Azobenzene groups are useful in Opto(genetic) pharmacology due to their property of: reversible isomerisation in response to different wavelengths of light light-activated irreversible release of a "caged compound light-activated irreversible crosslinking to cysteine residues reversibly crosslinking to cysteine residues Which of the following could be used to detect synaptic activity, i.e. vesicular neurotransmitter release at human brain inhibitory synapses. Note: more than one answer may be correct. Select all that you think apply. GluCl pH-sensitive GFP CNO activated DREADD cp. GFP fusion to Glutamate-binding protein cp-GFP fusion to GABA-binding protein