The ability of GPCs to differentiate into multiple stromal lineages was tested as previously described (Mohamed-Ahmed et al., 2018 (link)). Briefly, for adipogenic differentiation, cells in HPL and FBS were cultured in StemPro® adipogenic differentiation medium (Invitrogen) or standard growth medium (control). After 21 days, cells were fixed with 4% paraformaldehyde (PFA) for 10 min at RT and intracellular lipid formation was assessed via Oil red O staining (Sigma-Aldrich, St. Louis, MO, United States).
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