abstract = "We present an algorithm for identifying putative
ncRNAs using an RCSG (RNA Common Structural Grammar)
and show the effectiveness of the algorithm. The
algorithm consists of two steps: structure learning
step and sequence learning step. Both steps are based
on genetic programming. Generally genetic programming
has been applied to learn programs automatically,
reconstruct networks, and predict protein secondary
structures. In this study, we have applied genetic
programming to optimise structural grammars. The
structural grammars can be formulated by some rules as
tree structure including function variables. They can
be learned by genetic programming. We have defined the
rules on how structure definition grammars can be
encoded into function trees. The results we obtained
from the experiments with RCSG of tRNA and 5S small
rRNA and demonstrate the efficiency of our algorithm.",