Update 'README.md'

README.md

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 # PNAS23749
 
-Precapillary sphincters and pericytes at first-order capillaries as key regulators for brain capillary perfusion
+## **Precapillary sphincters and pericytes at first-order capillaries as key regulators for brain capillary perfusion**
 
-Summary
+### **Summary**
 
 In vivo two-photon microscopy data for studying the signanling of precapillary sphincters and pericytes. 
 
-Files
+### Files
 
 Each folder contains data files for each figure plots
 
-Authors
+### Authors
 
 Stefan Andreas Zambach, Changsi Cai, Hans Christian Cederberg Helms, Bjørn Olav Hald, Yiqiu Dong, Jonas Christoffer Fordsmann, Reena Murmu Nielsen, Jingshi Hu, Micael Lønstrup, Birger Brodin, Martin Johannes Lauritzen