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Synaptic versicles -- sphere-like structures that store and release neurotransmitters such as dopamine and serotonin, are found in the presynaptic terminals of neurons.

The broken DNA is processed to generate single-stranded overhangs termed presynaptic DNA.

The filaments formed by RecA enzymes stretch presynaptic single-stranded DNA by approximately 50% relative to its normal length7.

When the complementary DNA strand pairs with the RecA-coated presynaptic single-stranded DNA, it also adopts this extended conformation and is stabilized mainly by base-pairing interactions with the presynaptic DNA.

The non-displaced complementary DNA strand is positioned in a way that enables it to pair with the presynaptic single-stranded DNA.