IgE 

Present only at very low levels in blood or extracellular fluid but is bound avidly by receptors on mast cells.Antigen binding to this cell-associated IgE triggers mast cells to release powerful chemical mediators that induce reactions such as coughing, sneezing, and vomiting.

TLS Online TPP Program

#Id: 1353

#Unit 4. Cell Communication and Cell Signaling

GRB2 SH2 domain binds to a specific phosphotyrosine residue in the cytosolic domain of an activated RTK.

 

TLS Online TPP Program

#Id: 387

#Unit 2. Cellular Organization

The nucleosome has an approximate twofold axis of symmetry, called the dyad axis.

TLS Online TPP Program

#Id: 6704

#Unit 3. Fundamental Processes

The mechanism of pre-tRNA splicing differs in three fundamental ways from the mechanisms used by self-splicing introns and spliceosomes.

First, splicing of pre-tRNAs is catalyzed by proteins, not by RNAs. Second, a pre-tRNA intron is excised in one step thatentails simultaneous cleavage at both ends of the intron. Finally, hydrolysis of GTP and ATP is required to join the two tRNA halves generated by cleavage on either side of the intron.

TLS Online TPP Program

#Id: 6160

#Unit 3. Fundamental Processes

TLS Online TPP Program

#Id: 3596

#Unit 3. Fundamental Processes

Nirenberg and Matthaei therefore concluded that the triplet codon UUU encodes phenylalanine, poly(C) proline (polyproline), polyadenylate, poly(A), encodes polylysine.