101: Helper T Cell Action.                                                                    

102: Variations on a Theme.                                                                  

103: Coreceptor CD4.                                                                           

104: Class II MHC Protein.                                                                  

105: Presentation of Peptides from Internalized Proteins.                      

106: Consequences of Cytotoxic-T-Cell Action.                                  

107: T-Cell Activation.                                                                          

108: T-Cell Receptor Complex.                                                             

109: The Coreceptor CD8.                                                                    

110: T-Cell Receptor Class I MHC Complex.                                      

111: T-Cell Receptor.                                                                            

112: Anchor Residues.                                                                          

113: Class I MHC Peptide-Binding Site.                                              

114: Class I MHC Protein.                                                                    

115: Presentation of Peptides from Cytosolic Proteins.                         

116: Intracellular Pathogen.

RNA Synthesis and Splicing

117: The Discovery of Catalytic RNA Was Revealing in Regard to Both Mechanism and Evolution              

118: Complex Formed by TATA-Box-Binding Protein and DNA.           

119: Transcription Initiation.                                                                 

120: CAAT Box and GC Box.                                                             

121: TATA Box.                                                                                   

122: RNA Polymerase Poison.                                                              

123: Eukaryotic RNA polymerases                                                       

124: Transcription and Translation.                                                       

125: Transcription Is Catalyzed by RNA Polymerase                           

126: Antibiotic Action.                                                                         

127: Primary Transcript.                                                                        

128: Mechanism For the Termination of Transcription by Rho Protein.      

129: Effect of Rho Protein On the Size of RNA Transcripts.                  

130: Termination Signal.                                                                       

131: RNA-DNA Hybrid Separation.                                                    

132: Transcription Bubble.                                                                    

133: DNA Unwinding.                                                                         

134: Alternative Promoter Sequences.                                                  

135: Structure of the Sigma Subunit.                                                    

136: Prokaryotic Promoter Sequences.                                                  

137: Footprinting.                                                                                  

138: RNA Polymerase Active Site.                                                       

139: Subunits of RNA polymerase from E. coli                                   

140: RNA synthesis is a key step in the expression of genetic information.

141: RNA Polymerase Structures.                                                        

142: An Overview of RNA Synthesis                                                  

143: RNA Synthesis and Splicing                                                         

144: Problems                                                                                        

145: Summary                                                                                       

146: Comparison of Splicing Pathways.                                               

147: Self-Splicing Mechanism.                                                              

148: Structure of a Self-Splicing Intron.                                               

149: Self-Splicing. 

150: The Transcription Products of All Three Eukaryotic Polymerases Are Processed