Table 1.

N-terminal sequencing and ESI-MS of the products of selective acid hydrolysis of the AGPNa1 protein backbone (Fig. 2)

Fraction	N-terminal sequence*	Molecular mass, Da		Peptide
		Observed	Calculated† (Hyp/Pro)
H1	Blocked	5,434.0	5,434.7 (16/0)	‡Gln1 –Ala57
H2	TOAFAOSGGVAL	2,716.2	2,711.9 (3/4)	Thr59 –Ala88
		2,732.2	2,727.9 (4/3)	Thr59 –Ala88
H3	Blocked	8,261.2	8,259.7 (20/3)	‡Gln1 –Ala88

^*Determined by N-terminal protein sequencing. O, Hyp. 

^†Calculated with number of Hyp/Pro residues chosen to give a molecular mass most similar to the experimentally determined value. 

^‡Gln, pyroglutamate.