1. (a) Identification. Enzyme preparations are products that are used in the histopathology laboratory for the following purposes:

   1. (1) To disaggregate tissues and cells already in established cultures for preparation into subsequent cultures (e.g., trypsin);
   2. (2) To disaggregate fluid specimens for cytological examination (e.g., papain for gastric lavage or trypsin for sputum liquefaction);
   3. (3) To aid in the selective staining of tissue specimens (e.g., diastase for glycogen determination).
2. (b) Classification. Class I (general controls). This device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 864.9.

[45 FR 60592, Sept. 12, 1980, as amended at 54 FR 25045, June 12, 1989; 66 FR 38789, July 25, 2001]