Age-dependent hypopharyngeal gland size and protein content of stingless bee workers, Tetragonula pagdeni. - Straub, Lars; Sittisorn, Tanatip; Butdee, Jinatchaya; Promsart, Woranika; Rueangwong, Athitta; Camenzind, Domenic; Maitip, Jakkrawut (PLoS ONE, 2024)