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The researchers chose to investigate the protein basigin, which is found in the principal piece of the sperm tail until the developing sperm passes through a testicular structure known as the epididymis.
Ironically, the principal piece for the evening, Heritage, a four movement reflection on Liverpool's history, was the least intriguing of Lawrence's works, which also included a jokey tone poem about slow progress on the M25 London ring road.
The tail is composed of middle piece, principal piece and end piece.

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