RPS19 and cyst: These data implicate the predicted CCCH motifs as being necessary for ROCY1-driven DBA+ cyst formation in T. gondii, and based on the localization of tagged ROCY1 in cytoplasmic puncta as well as the propensity of proteins harboring CCCH-type zinc finger motifs to bind RNA, suggest that interactions with RNA by ROCY1 may be a key to its function in driving cyst formation.