Fig. S2.

The complex modulus G* of bulk PA gel measured using a rheometer with a parallel plate geometry (Gemini HRnano; Malvern Instruments). We can calculate the value of E* = 75.4 Pa through the relation E* = 2(1 + ν)G*. This value is consistent with E* = 80 Pa measured with optical tweezers when Va = 5 µm²/s (Fig. 2A).