About the Authors

Ze-Jun Wang

zejunwang@hotmail.com (ZW); theinbockel@howard.edu (TH)

Affiliation Department of Anatomy, College of Medicine, Howard University, Washington, DC, United States of America

Liqin Sun

Affiliation Department of Anatomy, College of Medicine, Howard University, Washington, DC, United States of America

Thomas Heinbockel

zejunwang@hotmail.com (ZW); theinbockel@howard.edu (TH)

Affiliation Department of Anatomy, College of Medicine, Howard University, Washington, DC, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ZW TH. Performed the experiments: ZW LS. Analyzed the data: ZW. Contributed reagents/materials/analysis tools: ZW LS. Wrote the paper: ZW TH.