Plays an important role in the synthesis of 18S rRNA but is not required for the 5.8S and 25S pathway. Is necessary for the cleavage at site A2. Is required for efficient association of RPS27 with the pre-ribosomal particle. Component of the 90S pre-ribosomal particle. Present with 2610 molecules/cell in log phase SD medium. Belongs to the RRP7 family.