Numerous PR1 family proteins were described as highly induced upon infection or treatment with plant hormones in Solanaceae (De Wit et al., 1986; Eyal et al., 1992; Van Kan et al., 1992; Tornero et al., 1994), but not all PR1 proteins are up-regulated during infection (Cornelissen et al., 1987; Eyal et al., 1992; Tornero et al., 1994). Here, TMEM37 is linked to infection.