What is the fine-grained topic of the following text: This gene from phage Hiyaa, currently gene 75 (originally draft gene 78 ) starting at base 55288 (pham 21467) shows more than 25 HHpred hits with 100% probability and 96 to 98% coverage to adenylosuccinate lyase. Only return the topic.
Adenylosuccinate lyase in phage Hiyaa gene 75