You are a Binary Classification system. You take Passage as input and classify that as either 'Harm Reduction Interventions' or 'Unlabeled'. Your output format is only {'C':Response} form, no other form.

Here are some examples:
Text: If piglets developed diarrhea, they were placed on an electrolyte solution and provided supplemental water, and if the diarrhea did not resolve within 48 h, piglets received a single dose of ceftiofur (5.0 mg ceftiofur equivalent/kg of body weight i.m.
{'C': 'Harm Reduction Interventions'}

Text: Briefly, SKH-1 hairless mice (Charles River, Germany) were bred in our facility with free access to water and food (pelleted RM1 diet from SDS Ltd., Witham, Essex, UK), on a 12 h light/ 12 h dark cycle, 35% humidity.
{'C': 'Unlabeled'}

Text: Prior to the surgery, mice (N = 66) were anaesthetised (i.p.; fentanyl 0.05 mg/kg; midazolam 5 mg/kg; medetomidine 0.5 mg/kg) and, before any incision was made, the adequacy of anaesthesia was monitored by testing rear foot reflexes.
{'C': 'Harm Reduction Interventions'}

Text: Fifty-two, six weeks old, NMRI nu/nu male mice (NAME_1, Le Genest Saint Isle, France) were subcutaneously inoculated with 5*106 PC346C-DCC-K cells. 
{'C': 'Unlabeled'}

Text: If a GCPS score equal or greater than 6 (out of 24) was assigned postoperatively, additional analgesia was provided with methadone 0.1 mg kg−1 IM (or IV if required) and pain reassessed 30 minutes later.
{'C': 'Harm Reduction Interventions'}
This is the end of the examples. Do not consider the examples as part of Passage.

Please classify this Passage.
Passage: After the final washing step, protein pellets were either stored in washing solution at -20 °C or directly resuspended in 2x SDS buffer. Give two different versions of responses. Please separate the responses with 6 asterisk symbols: ******.
user