RT Journal Article SR Electronic T1 Twin Studies Go Back to the Womb JF Science JO Science FD American Association for the Advancement of Science SP 165 OP 165 DO 10.1126/science.257.5067.165 VO 257 IS 5067 A1 Aldhous, Peter YR 1992 UL http://science.sciencemag.org/content/257/5067/165.abstract AB