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Other 3D systems: here, we find gel-based and mechanical systems devoid of any cell line, except for the organism of study. These include hydrogels, 3D printed arrays, and filtration systems. The sources shown are references 65 (Leung et al., 2014), 66 (Pavlou et al., 2020), 68 (Kanatani et al., 2015), 114 (Hellmann et al., 2011), 116 (Ripp et al., 2021), 134 (Ramdani et al., 2015), and 137 (Kan et al., 2014).
