A method is outlined which permits one to estimate the reliability of
alignment procedures by comparing the real alignment obtained by gener
ating appropriate sequences with the results of the alignment procedur
e. The use of the method is illustrated by testing the OPAL286 program
. The relation between reliability of the results (i.e. reconstruction
of the real alignment) and the proportion of mutations and deletions
is discussed. The proposed method provides an optimal choice of parame
ters with respect to alignment reliability.