<unk> <unk> <unk> <unk> <unk>  Stephen William Kuffler (August 24 Tap, Hungary, 1913 <unk> October 11, 1980) was a pre-eminent Hungarian-American neurophysiologist. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Kuffler, alongside noted Nobel Laureates Sir John Eccles and Sir Bernard Katz gave research lectures at the University of Sydney, strongly influencing its intellectual environment while working at Sydney Hospital. ąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąą He is known for his research on neuromuscular junctions in frogs, presynaptic inhibition, and the neurotransmitter GABA.<unk> He is known for his research on neuromuscular junctions in frogs, presynaptic inhibition, and the neurotransmitter GABA. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️  Question: What is the name of the neurotransmitter that he is known for?
<unk> <unk> <unk>