B. Shen, X. Yang, S. E. Noll, X. Yang, Y. Liu, S. Jia, J. Zhao, S. Zheng, R. N. Zare, and H. Zhong, “Cell-Based Ambient Venturi Autosampling and Matrix-Assisted Laser Desorption Ionization Mass Spectrometric Imaging of Secretory Products,” Anal. Chem. 94, 3456-3466 (2022).