The phrase "approaches we previously" is correct and usable in written English.
It can be used when referring to methods or strategies that were discussed or utilized in the past.
Example: "In our last meeting, we reviewed the approaches we previously implemented to improve team productivity."
Alternatives: "methods we discussed earlier" or "strategies we used before".
Using multiple approaches, we previously showed that MHV-68 ORF33 is a tegument protein that is essential for virion morphogenesis (Guo et al., 2009).
Using biochemical purification approaches, we previously verified that YY1 is tightly associated with the human INO80 (INO80) chromatin remodeling complex (Jin et al. 2005).
In different cell systems, and using different mechanistic approaches, we previously demonstrated that an impaired RARα signalling, due to derangement/loss of RARα itself, confers an exacerbated repressed chromatin state, marked by repressive epigenetic changes at several RA-responsive genes downstream of RARα [7] [9].
Using in vivo selection approaches, we previously isolated 4T1-derived breast cancer cells that preferentially metastasize to these organs and tissues.
Using biophysical approaches, we previously showed that store-operated Ca2+ entry (SOCE) is compromised in aged skeletal muscle but not in young ones.
Furthermore, using proteomic approaches we previously identified several proteins in the MAPK-ERK-RAS mitogenic pathway that were differentially expressed in the MCF7 D3res cells relative to their sensitive MCF7 counterparts under basal conditions [ 9].
Using the OBOC approach, we previously discovered three cyclic peptide ligands that target α3β1 in U-87MG cells: LXY1, LXY3, and LXY4.
Using this approach, we previously transplanted the human immunodeficiency virus 2F5 and 4E10 epitopes onto heterologous proteins to design novel "epitope-scaffold" antigens.
Using a mass spectrometry approach we previously developed, we show that SIRT expression and deacetylase activity in these cells changes greatly with differentiation state (undifferentiated vs. megakaryocytic differentiation vs. erythroid differentiation).
By applying the HS imaging and analysis approach we previously established, in this paper, we therefore quantify the spectral changes experienced in cellular environments by PEGylated AuNPs as compared with bare AuNPs and study how spectra are further impacted by serum concentration (0, 10, 25, or 50%% human serum).
In accordance with this approach we previously demonstrated that in MOH patients with low medical needs and migraine as the primary headache type advice and education were as effective as structured inpatient and outpatient detoxification programmes in achieving withdrawal of the overused medication/s [24].
