Df. Barber et al., CUTTING EDGE - THE EXPRESSION IN-VIVO OF A 2ND ISOFORM OF PT-ALPHA - IMPLICATIONS FOR THE MECHANISM OF PT-ALPHA ACTION, The Journal of immunology (1950), 161(1), 1998, pp. 11-16
A second isoform of pT alpha, ''pT alpha(b),'' is derived from the pT
alpha locus by tissue-specific, alternative splicing, pT alpha(b) is c
oexpressed in the thymus with the previously characterized form of pT
alpha (which me term pT alpha(a)) and is also expressed in peripheral
cells without pT alpha(a), While pT alpha(a) acts to retain most TCR b
eta-chains intracellularly, pTa alpha(b) permits higher levels of cell
surface TCR beta expression and facilitates signaling from a CD3-TCR
beta complex.