Siphovirus Φ187, which is only distantly related to ΦE72 and requires GroP-WTA modified with GalNAc for infection of target cells (25), still bound to the GroP-WTA glucose-deficient mutants (Fig. 5a), indicating that the GroP-WTA glucose modifications are not necessary for Φ187 binding. This evidence concerns the gene CXCL1P1 and infection.