You may type 1 digit into the first field (the enzyme class),
1 or 2 digits into the second and third fields (subclass and sub-subclass),
and up to 3 digits into the fourth field. For example, you may type
18.104.22.168 to get the corresponding ENZYME entry.
You may also enter a partial EC number in order to get a list of all
ENZYME entries whose EC numbers begin with the given pattern. For example,
you may just type 1.2. . .