collagen synthesis controlled study 4 nonhuman 4 enzyme activity 3 priority journal 3 Article 2 Eurycoma longifolia 2 animal cell 2 animal experiment 2 animal model 2 article 2 cell differentiation 2 cell growth 2 cell proliferation 2 cell viability 2 comparative study 2 granulation tissue 2 in vitro study 2 male 2 mouse 2 osteoblast 2 phase contrast microscopy 2 rat 2 upregulation 2 5α-dihydrotestosterone 1 Androgen-deficient osteoporosis 1 Bone formation 1 Cell proliferation 1 Collagen deposition 1 Eurycoma 1