Spermatophore development in drones indicates the metabolite support for sperm storage in honey bees (<i>Apis cerana</i>).

3 Results 3.1 Morphological analysis Morphological measurements and data analysis of three groups of drones from 0 to 24 days showed a decreasing trend in body mass ( Figure 1A ).

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All three groups of drones showed a trend toward a slow decrease in body length ( Figure 1B ).

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The length of the seminal vesicles slowly decreased after 4 days, while the middle width showed an increasing trend throughout the developmental cycle with increasing age.

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