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Living vertebrates are divided into those that possess a fully formed and fully mineralised skeleton (gnathostomes) versus those that possess only unmineralised cartilaginous rudiments (cyclostomes). As such, extinct phylogenetic intermediates of these living lineages afford unique insights into the evolutionary assembly of the vertebrate mineralised… (More)
The use of SPECT in conjunction with I-123 HIPDM is a promising scintigraphic approach to the assessment of regional cerebral tissue perfusion.