GRanting access to a Sequence

I am attempting to grant select access to sequence called sq_cmnt_no_01 but has receive the following error:

 grant select to sq_expat_cmnt_no_01 to public

ERROR at line 1:
ORA-00990: missing or invalid privilege

I have the following system privilege as a DBA:

GRANTEE                        GRANTED_ROLE                   ADM DEF
------------------------------ ------------------------------ --- ---
SYSTEM                         DBA                            YES YES

How can I get around this error and grant select access to this sequence (if possbile)? Received on Fri Feb 19 1999 - 19:15:36 CST