Number of sequences in PANTHER families and subfamilies. (A) the distribution of the sizes of PANTHER/LIB families. Note that families are limited to no less than 10 sequences, and no more than 1000 sequences. (B) distribution of the sizes of PANTHER/LIB subfamilies. Singleton subfamilies are not included in the figure. The insets show a more detailed view of the distributions for sizes smaller than 100 sequences.