Table 1.

Summary of the average length and net charge of the four classes of AMPs in the APD3 database.

	$\mathit{\alpha }$	$\mathit{\beta }$	$\mathit{\alpha }\mathit{\beta }$	Non-$\mathit{\alpha }\mathit{\beta }$	Unknown
Total no. of peptides	494	89	120	22	2710
Average length	29.66	35.08	58.92	26.82	--
Average net charge	+3.63	+3.65	+5.37	+2.55	--