One of acini of hypopharyngeal glands of honey bee worker. After Kheyri (2012) Novel actin rings within the secretory cells of honeybee royal jelly glands,
Cytoskeleton
, Volume 69, p.1032-1039, (2012)
[1]. (scale bar = 50 micrometers)
ARin - actin ring
CaCel - canal cell
SeCel - secretory cell
EApa - end apparatus
HfDct - collecting duct
Nu - nucleus

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Each of the acinus consists of 5-20 gland units. Each gland unit (marked red) consists of two cells: canal cell and secretory cell.