Table 1. Volume and concentration of protease in the drops (total volume of 0.56–0.6 µl).

	Drop 1	Drop 2	Drop 3	Drop 4	Drop 5
Volume (µl)	0.01	0.02	0.03	0.04	0.05
Concentration (µg ml−1)	1.8	3.5	5.2	6.8	8.3
No. of crystals	4–14	3–10	16–18	1–4	5–13
Crystal dimensions (µm)	25 × 25 × 31	25 × 31 × 37	12 × 19× 25	44 × 50 × 56	12 × 19 × 31