A simple example block file.  The important parts are the lines that
start with the greater than character - these are identifer lines for the
sequences.  The first star is above the position of the first sequence 
in the alingmnet which is written VERTICALLY down the page.  The second 
star shows the end of the alignment.

Anything else can be written here, except greater than signs and stars.

This is the format produced by the AMPS package for multiple 
sequence alignment.


>one
>two
>three
>four
>five
*
ABCDE
EDFTD
AAAAA
LLL  
PPPPP
GGGGG
SSSSS
KLMNT
TTLPQ
SLNST
TTLSN
LQPPL
LLLLL
TTTTT
*