def subset_wirasinha(df, subset = 't_p', tcr_b = 'poly', chain = 'b'):
	"""
	Subsets the Wirasinha.migec.txt dataframe
	"""
	ind1 = df['subset'] == subset
	ind2 = df['tcr_b'] == tcr_b
	ind3 = df['chain'] == chain
	sdf = df[(ind1&ind2&ind3)]
	return sdf.copy()