Table 1. Incorporation of ³²P into specific in vitro phosphorylation sites in DCX by cdk5.

Cerenkov radiation (c.p.m.)	% c.p.m.	Summed fractions	Phosphorylation site	Sequence (phospho-site in bold)	HPLC fraction (Figure 2a)
4360	43	17–23(1/2)	Ser-339, Ser-332 (minor)	…KSKQSPISTPTSPGSL…	iv, v
2399	24	23(1/2)–28	Ser-28	…NGLPSPTHS…	vi, vii
1289	13	4–5	Ser-287, Thr-289	…GPKASPTPQKT…	i
1269	13	8–10	Ser-297	…TSAKSPGPM…	ii
783	8	12–14	Thr-326	…SQLSTPKSK…	iii