This release contains only the music track from Base by Base Episode 405.

Song title: Symmetry in the Sparks
Original Base by Base episode: 405: PRDM9 and the Hotspot Trade-off

Article metadata:
Article title: On the origin of PRDM9-guided recombination hotspots
Journal: Proceedings of the National Academy of Sciences (PNAS)
DOI: 10.1073/pnas.2535682123
Reference: Úbeda F, Bürger R, Fyon F. On the origin of PRDM9-guided recombination hotspots. Proc Natl Acad Sci U S A. 2026;123(26):e2535682123. doi:10.1073/pnas.2535682123

Lyrics:
Verse 1
In the quiet split of a cell-made night,
Two threads drift close to trade their light.
Some marks are scattered, some are drawn,
A hidden map we’re walking on.

Pre-Chorus
If you bind too often, you pay the cost,
Connections blur and chances get lost.
But when the meeting’s mirrored, side by side,
That’s where the crossover can decide.

Chorus
Let it meet in symmetry, let it lock in time,
Two matching hands on the same thin line.
Even if the net runs lower, it can still ignite—
When mirrored sparks turn into new life.

Verse 2
One path aims anywhere, wide and free,
One path writes names on the genome’s sea.
And sometimes both can share the stage,
Swinging in cycles from age to age.

Bridge
On bigger strands, the pressure’s real—
Miss one exchange and the whole thing can peel.
So the system learns what it can’t ignore:
Make the surest crossover worth fighting for.

Final Chorus
Let it meet in symmetry, let it lock in time,
Two matching hands on the same thin line.
Trade a little binding for a clearer sign—
And watch the hotspots hold the line.