@incollection{El-Esawi18, author = {Mohamed A. El-Esawi}, title = {Introductory Chapter: Circadian Rhythms and Their Molecular Mechanisms}, booktitle = {Circadian Rhythm}, publisher = {IntechOpen}, address = {Rijeka}, year = {2018}, editor = {Mohamed Ahmed El-Esawi}, chapter = {1}, doi = {10.5772/intechopen.78756}, url = {https://doi.org/10.5772/intechopen.78756} }