Presence of pH2‐Sensitive Circulating Interferon Among Callithrix jacchus Marmosets

Abstract
Significant and relatively stable levels of serum‐interferon were demonstrated in a Callithrix jacchus population. This circulating interferon was acid‐sensitive in all cases, classifying it as immune or “γ‐type” interferon. Our results in these hematopoietic chimeras suggest that the presence of immune‐type or at least pH 2‐sensitive interferon could be related to the presence of two allogenic lymphocyte populations in each marmoset.