 Non-coding RNA (ncRNA ) presents a challenge for homology detection, as the primary sequence is often poorly conserved and de novo structure prediction remains difficult.
<clarity>  Non-coding RNA (ncRNA ) presents a challenge for homology detection, as the primary sequence is often poorly conserved and de novo structure prediction remains difficult.
 ncRNA presents a challenge for homology detection, as the primary sequence is often poorly conserved and de novo structure prediction remains difficult.