Table 2. Crystal analysis by N-terminal sequencing.

	Propeptide		Catalytic subunit
Cycle	Amino acid	C1 (pmol)	Amino acid	C2 (pmol)	Ratio C1/C2
1	Val	69.52	Ala	80.41	0.865
2	Gly	74.25	Ser	37.26†	1.992†
3	Val	64.05	Asn	51.51	1.243
4	Asn	63.74	Ser	29.73†	2.143†
5	Pro	44.96	Leu	46.35	0.970
6	Leu	51.35	Gln	50.64	1.014
7	Pro	41.94	Tyr	48.04	0.873
8	Ala	58.40	Val	48.81	1.196
9	Pro	31.66	Asn	44.65	0.709
10	Arg	39.97	Val	48.59	0.823
Average	—	—	—	—	0.961

^†Serine is degraded during Edman sequencing, thus these ratios were not considered in determining the average propeptide to catalytic unit ratio.