piece

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Morphologic assessment of sperms revealed a high incidence of abnormal head shape, degenerated middle piece, undulating plasma membrane and deformed axoneme structure (figs.
The 5-[micro]m long middle piece is the first part of the tail.
But the middle piece is the trickiest and involves permanently closing the ramp that loops motorists from eastbound Ventura Boulevard onto the northbound 405 near the Sherman Oaks Galleria.