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Distal (Left) and lateral (Right) views of fossil hominin and modern human first MT (MT1) heads. Note that H. sapiens is characterized by dorsal overlap of the distal articular surface onto the MT shaft and by wide flattening of the dorsal articular surface (arrows). (Scale bar: 1 cm.) H. erectus, Homo erectus; P. troglodytes, Pan troglodytes.
