The wheelbases will be classified into standard, long and extra long variants. (motorbeam.com)
A study published in 2011 of 2,500 + individuals followed from 1995 - 2008 as part of the US National Longitudinal Study of Adolescent Health found that twice as many respondents with two 5 - HTTLPR long variants said they were very satisfied with life compared with carriers of two short versions. (snpedia.com)
The relationship of the serotonin transporter (SLC6A4) extra long variant to gene expression in an African American sample (cambridge.org)