Figure 1

Sample presentation. (a) Schematic perspective view of the sample presentation: the gel (black) was poured in a 10 × 10 mm spacer (blue) on the coverslip (gray). The enzyme (maroon) was deposited on the right side of the gel. The sample was covered with glycerine before observation (not represented). (b) Schematic side view of the gel (black) poured in a spacer (blue) on the coverslip (gray), and then covered with glycerine (light pink) and observed on the inverted microscope. The enzyme (maroon) was deposited on the right side of the gel