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Contents

Abstract                                                                                 ii

Acknowledgments                                                         iii

Listoflllustrations                                                                    vii

List of Tables                                                                          viii

1  Introduction                                                       1

1.1 Motivation.....................................  .    1

1.2  Background ...................................... 5

1.2.1 Ih and HCN Channels . .......................... 6

1.2.2 ElectricalCouplingintheRetina ..................... 9

2 Materials and Methods                                         11

2.1  Materials............  11

2.2  Solutions........................................ 12

2.3  Recordings......................................  13

2.4  Immunohistochemistry and Western Blot..................... 16

2.5  Data analysis...................................... 18

2.6  Numerical Methods.................................. 21

3 Properties and Function of HCN Channels in Photoreceptors     22

3.1  Introduction.......     22

3.2  MolecularandBiophysicalProperties...........  24

3.2.1   Whole-cell currents . ............................ 24

3.2.2   Distribution and Molecular Identification................ 27

3.2.3  HcNlsinglechannelconductance.................... 30

3.3  FunctionofHcNchannelsinphotoreceptors.................. 34

3.3.1 SimulatedHcNcurrentduringrodlightresponse........... 34

3.3.2 HCN contribution to photoreceptor membrane frequency response 37

3.3.3 Equivalent circuit...........    39



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