Staley R N, Vance J P, Loucks C D
Orthodontic Department, College of Dentistry, The University of Iowa, Iowa City 52242, USA.
Am J Phys Anthropol. 1998 Jan;105(1):93-5. doi: 10.1002/(SICI)1096-8644(199801)105:1<93::AID-AJPA10>3.0.CO;2-G.
A Type II tooth cusp occurrence asymmetry proposed for human twins in 1974 but not observed until recently was described in a female monozygotic twin pair.