After 72 h crystallization, mother liquor was removed from crystals via a paper towel and 20 µl crosslinking solution containing 2 mM BMOE in crystallization buffer were added to collected crystals. After cross-linking for 24 h at 8 °C, cross-linking mother liquor was removed via paper towel. Then, CLECs were submerged in 5 µl 50 mM Tris•SO4 pH 7.0 and subsequently removed via paper towel. To monitor CLEC stability, CLECs were placed in 20 µl 50 mM Tris•SO4 pH 7.0 and stored for 72 h at 8 °C following microscopic inspection.