Once genes within chromosomal regions of interest have been precisely identified and the strength of QTL for meat quality determined, this could permit direct genetic selection through use of molecular markers, provided the same mechanisms are shared by commercial populations.
ELP has been precisely engineered so that TP < TT < TH.
Additionally, there has been no empirical test of this possibility for naturally occurring alleles [ 14] because definitive sexually-antagonistic allelic variation has never been precisely identified.
Although the MIC-1 receptors have not been precisely identified, it has been reported that the secreted MIC-1 protein can induce its biological effects through the activation of type I and type II membrane serine/threonine kinase receptors for TGF- β family members (Tan et al, 2000; Xu et al, 2006; Johnen et al, 2007; Soto-Cerrato et al, 2007; Ago et al, 2010; Mimeault and Batra, 2010a).
However, the exact source of the tachykinin peptides has never been precisely identified.
Although genes responsible for C4-specific leaf anatomy, the transport of metabolites, and the cell signaling and regulation required for optimal functioning have not been precisely identified, the main enzymatic steps have long been known (Hatch and Slack 1968; Johnson and Hatch 1970; Hatch 1987; Kanai and Edwards 1999).
Although IL-7 plays a critical role in the thymus and peripheral T cell homeostasis, stromal cells producing IL-7 have never been precisely identified.
The DC subpopulation/s that are involved in presentation of tumor antigen in B16.OVA melanoma tumors have not been precisely identified, however, in other tumor models multiple DC subpopulations can present tumor antigen in the draining LN [45].
Most commonly, this involves loss in chromosome 18; however, no target gene has so far been precisely identified.
