TREG cells were most recently characterized as a unique subset of CD4+ T cells that express high levels of the IL-2R  chain (CD25), the low-affinity receptor for this cytokine.

TLS Online TPP Program

#Id: 7409

#Unit 5. Developmental Biology

The wingless (wg) gene is activated in those bands of cells that receive little or no Even-skipped or Fushi tarazu protein, but which do contain Sloppy-paired

TLS Online TPP Program

#Id: 7410

#Unit 5. Developmental Biology

Once wingless and engrailed expression patterns are established in adjacent cells, this pattern must be maintained to retain the parasegmental periodicity of the body plan.

TLS Online TPP Program

#Id: 7411

#Unit 5. Developmental Biology

TLS Online TPP Program

#Id: 7412

#Unit 5. Developmental Biology

The maintenance of patterns is regulated by reciprocal interaction between neighboring cells: cells secreting Hedgehog protein activate wingless expression in their neighbors, and the Wingless protein signal, which is received by the cells that secreted Hedgehog, serves to maintain hedgehog (hh) expression

TLS Online TPP Program

#Id: 7413

#Unit 5. Developmental Biology

Wingless protein also acts in an autocrine fashion, maintaining its own expression

TLS Online TPP Program

#Id: 7414

#Unit 5. Developmental Biology

The homologue of β-catenin in Drosophila is Armadillo.