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Figure 3. (A) Assembly of graded modulus gel and tensile test of a modulus-graded gel compared with its finite element modeling simulation^[28]. Reprinted with permission. Copyright 2020, Springer Nature; (B) Construction of soft e-skin on biogel substrate attached to a human arm^[28]. Reprinted with permission. Reprinted with permission. Copyright 2020, Springer Nature; (C) Illustration of integrated soft electronics with gelatin-alginate as biogel substrate^[30]. Reprinted with permission. Reprinted with permission. Copyright 2022, WILEY-VCH; (D) Illustration of multiresponsive metal-crosslinked alginate/gelatin organohydrogel (MAlgGel) on skin for thermal, photo, humidity, and strain sensing applications^[34]. Reprinted with permission. Copyright 2022, WILEY-VCH; (E) Schematic illustration of the ionic biogel fabrication process and its versatility^[38]. Reprinted with permission. Copyright 2024, WILEY-VCH; (F) Schematic illustration of the preparation of the MCG organohydrogel^[43]. Reprinted with permission. Copyright 2022, Elsevier; (G) Chemical composition, liquid-to-solid transformation, and application of in situ biogel^[45]. Reprinted with permission. Copyright 2025, Springer Nature. PEDOT: poly(3,4-ethylenedioxythiophene); PSS: poly(styrenensulfonate); DES: deep eutectic solvent; MCG: MXene-composited gelatin.