Approximately 15 different subtypes have been identified based upon abnormal changes (mutations) of certain genes.

Character and string types can have different subtypes according to the required character "width".

There is some difference in ages of the peak incidence for the different subtypes with considerable overlap as described below.

Classifying the different subtypes of aphasia is difficult and has led to disagreements among experts.

One source even breaks Taijin into two different subtypes: neurotic and offensive.

The use of systems biology to stratify disease into its different subtypes allowing for more effective treatment.

The disorder was later found to have many different subtypes, now grouped in three major categories.

There is sometimes a confusion in the different subtypes.

Words and phrases are two different subtypes of sign.

Both these types have different subtypes depending on their intended use.