Well, is it dubious? Gong et al. state that the roots ARE exposed; "Interestingly, much of the effective erupted length of the teeth is composed of the tooth root" But I agree with you about a CT scan. --- On Thu, 12/24/09, Augusto Haro <augustoharo@gmail.com> wrote: > From: Augusto Haro <augustoharo@gmail.com> Subject: Re: Venom in > Sinornithosaurus To: dannj@alphalink.com.au Cc: dinosaur@usc.edu > Date: Thursday, December 24, 2009, 4:14 AM Anyway, I think that if > we consider dubious whether the roots are exposed or not, I suppose > CT scanning may help settling the question (whether or not the > alveoli are partially empty, as most suppose).