Electron micrographs at 10 x magnification of litchi pericarp tissue at different storage times. a1 shows the microstructure of the pericarp of fresh litchis 1 day after harvest; a2 shows the microstructure of the pericarp of fresh litchis 3 days post-harvest; b1 shows the microstructure of the pericarp of AF (-35 °C) litchis frozen and stored for 1 day; b2 shows the microstructure of the pericarp of AF (-35 °C) litchis frozen and stored for 60 days; c1 shows the microstructure of the pericarp of IF (-35 °C) litchis frozen and stored for 1 day; c2 shows the microstructure of the pericarp of IF (-35 °C) litchis frozen and stored for 60 days (bar = 200 µm). Samples were stained with toluidine blue solution (0.1 g/L) for 5 s.