INTERIM REFERENCE PREPARATION OF INTERLEUKIN-7 (recDNA HUMAN TYPE)

AMPOULE CONTENTS

Each ampoule contains the residue after freeze-drying of 0.5 ml of a 0.15M solution of sodium chloride that contained: approximately 1 microgram IL-7; 0.5 mg trehalose; 1.0 mg human serum albumin.

UNITAGE

The assigned potency is 100,000 reference units (RU) per ampoule.

CAUTION

The preparation contains material of human origin (human serum albumin) which has been tested and found negative for HB_sAg and anti-HIV (LAV/HTLV III virus) antibody. However, as with all preparations of human origin, this material cannot be assumed to be free from infectious agents. Suitable precautions should be taken in the use and disposal of the ampoule and its contents. This preparation is not for administration to humans.

USE OF AMPOULED MATERIAL

For all practical purposes, each ampoule contains the same quantity of the substances listed above. Dissolve the total contents of the ampoule in a known volume of a suitable solvent (distilled water, saline or buffer) with carrier protein where extensive dilution is required. No attempt should be made to weigh out any portion of the freeze-dried material.

STORAGE

Unopened ampoules should be stored at -20^oC. For economy of use, it is recommended that the solution be sub-divided into several small containers and stored at -40^oC or below. The ampoules do not contain bacteriostat and solutions of the ampouled preparation should not be assumed to be sterile.

CITATION

In all publications in which this preparation is used as an assay calibrant, it is important that the title of the preparation and ampoule code be cited correctly.

This reagent is available in small amounts (approximately 1 microgram/sample) for use in the calibration of in vitro bioassays and in-house standards only and are not to be used for experimental purposes. Reference reagents are available to investigators with peer-reviewed support, at institutions or at commercial establishments and are limited to one sample of each reagent per year.