CLUSTAL format, in which each sequence and its name are on the same line and the sequences can be partitioned into a number of blocks separated by empty lines. The word "CLUSTAL" indicating the format can begin in the first line, but such a first line is optional.

CLUSTAL format Example:

seq0   FQTWEEFSRAAEKLYLADPMKVRVVLKYRHVDGNLCIKVTDDLVC
seq1   -------KYRTWEEFTRAAEKLYQADPMKVRVVLKY----RHCDG
seq2   EEYQTWEEFARAAEKLYLTDPMKVRVVLKYRHCDGNLCMKVTDDA

seq0   LVYRTDQAQDVKKIEKF
seq1   NLCIKVTDDV-------
seq2   VCLQYKTDQAQDVKK--