TGF-β1 and PDGF-BB were measured after activation in both PPP and PRP fractions to assess the effect of the centrifugation in PLTs and associated GFs. TGF-β1 and PDGF-BB were measured using ELISA kits (Human TGF-beta 1 DuoSet ELISA de R&D Systems DY240-05 and Human PDGF-BB DuoSet ELISA de R&D Systems DY220, respectively) according to manufacturer's instructions. These GFs were determined using human antibodies because these kits have been used for the same purposes in other feline PC studies (20 (link), 44 (link)) since it has been reported that human and cat PDGF-BB present high peptide sequence homology (45 (link)).
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