To prepare stock solutions, dissolve in PBS or other buffer at 50 ug/mL. For 5 ug size, add 100 uL buffer to the vial; for 25 ug size, add 0.5 mL buffer to the vial; mix gently to dissolve. Note: Due to the small amount in the vial, lyophilized conjugates may not be visible. Stock solutions may be very pale or colorless depending on the conjugate.