This heterodimer may have anti-inflammatory properties, since the myrmexin complex (composed of 6 SS-LS heterodimers) inhibits carrageenin-induced edema in a dose-dependent manner (after subcutaneous injection into rats). Heterodimer composed of subunit SS3 and subunit LS1 (U1-PSDTX-Pt1f), and heterodimer composed of subunit SS3 and LS2 (U1-PSDTX-Pt1d); disulfide-linked. Expressed by the venom gland. There are 6 heterodimeric myrmexins which consist of a small subunit (SS1 or SS2 or SS3) disulfide-linked to a larger, quite structurally unrelated subunit (LS1 or LS2). MALDI experiments give a mass of 7143 Da for U1-PSDTX-Pt1d heterodimer (SS3+LS2). MALDI experiments give a mass of 7069 Da for U1-PSDTX-Pt1f heterodimer (SS3+LS1). Belongs to the myrmexin family.