Figure 4 from: Ali H, Alqarni AS, Iqbal J, Owayss AA, Raweh HS, Smith BH (2019) Effect of season and behavioral activity on the hypopharyngeal glands of three honey bee Apis mellifera L. races under stressful climatic conditions of central Saudi Arabia. Journal of Hymenoptera Research 68: 85-101. https://doi.org/10.3897/jhr.68.29678

Figure 4 - Inter-race comparison of acini size (length, width, and surface area) among the HPGs of A. mellifera A summer nurse B summer forager C winter nurse D winter forager. Graph bars headed by the same letter represent non-significant differences between the groups (LSD test at p ≤ 0.05).