Registered FDA human cell and tissue establishments whose firm name contains what the filer has typed (typeahead), for the manufacturer question that feeds the HRN affirmation. HRN is the establishment's registration number, which HCTERS publishes as its FDA Establishment Identifier and which no filer can look up. The name alone answers HRN outright for most registered firms; this is for the rest, where a firm is registered at several sites and only the filer knows which made the tissue. Only Registered establishments are offered, since an inactive registration does not satisfy the affirmation. Matching is substring and case-insensitive; returns empty for fewer than two characters.