The reviewers challenged us to look for the HGT candidates in the nearest non-metazoan outgroup, choanoflagellates. We are using _Salpingoeca rosetta_ and _Monosiga brevicollis_, two model choanoflagellates with publically available genomes.
In both cases the only relevant hit that is found is c103983_g1, the gene EggNOG v5.0 identifies as "metal-dependent hydrolase - Proteobacteria" and MorF putatively identifies as an aminohydrolase.